diff --git a/book.toml b/book.toml
index fbcd4d5..829cc9e 100644
--- a/book.toml
+++ b/book.toml
@@ -15,6 +15,8 @@ mathjax-support = true
 additional-css = ["ferris.css"]
 additional-js = ["ferris.js"]
 heading-split-level = 2
+default-theme = "light"
+preferred-default-theme = "light"
 
 [output.html.fold]
 enable = false # whether or not to enable section folding
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index c045bc7..b14d6e1 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -101,7 +101,6 @@ Intro to testing
 Gui stuff
 -->
 
-# Modern Java
 
 - [Prelude](./prelude.md)
   - [Asking for Help](./prelude/asking_for_help.md)
@@ -109,7 +108,46 @@ Gui stuff
   - [Lies](./prelude/lies.md)
   - [AI](./prelude/ai.md)
   - [Java](./prelude/java.md)
-- [Getting Started](./getting_started.md)
+
+# The Computing Environment
+
+- [Hardware](./hardware.md)
+  - [CPU](./hardware/cpu.md)
+  - [RAM](./hardware/ram.md)
+  - [Hard Drives](./hardware/hard_drives.md)
+  - [Motherboard](./hardware/motherboard.md)
+- [Operating Systems](./operating_systems.md)
+  - [Personal Computers](./operating_systems/personal_computers.md)
+  - [Servers](./operating_systems/servers.md)
+  - [Mobile Phones](./operating_systems/mobile_phones.md)
+  - [Game Consoles](./operating_systems/game_consoles.md)
+  - [Abstractions](./operating_systems/abstractions.md)
+  - [Defaults](./operating_systems/defaults.md)
+
+# Modern Java
+
+- [Set Up Your Computer](./text_editors/set_up_your_computer.md)
+  - [Text Editors](./text_editors.md)
+  - [IDEs](./text_editors/ides.md)
+  - [VSCodium](./text_editors/vscodium.md)
+  - [Install VSCodium](./text_editors/install_vscodium.md)
+  - [Install Java](./text_editors/install_java.md)
+- [The Terminal](./the_terminal.md)
+  - [Bash](./the_terminal/bash.md)
+  - [Windows Subsystem for Linux](./the_terminal/windows_subsystem_for_linux.md)
+  - [Chromebooks and School Computers](./the_terminal/chromebooks_and_school_computers.md)
+  - [Commands](./the_terminal/commands.md)
+  - [Directories](./the_terminal/directories.md)
+  - [Listing Files](./the_terminal/listing_files.md)
+  - [Creating Directories](./the_terminal/creating_directories.md)
+  - [Changing Directories](./the_terminal/changing_directories.md)
+  - [Creating Files](./the_terminal/creating_files.md)
+  - [Run Java Programs](./the_terminal/run_java_programs.md)
+  - [Getting Used to it](./the_terminal/getting_used_to_it.md)
+  - [Challenges](./the_terminal/challenges.md)
+
+
+<!-- - [Getting Started](./getting_started.md) -->
 - [First Steps](./first_steps.md)
   - [Comments](./first_steps/comments.md)
   - [Semicolons](./first_steps/semicolon.md)
@@ -445,7 +483,7 @@ Gui stuff
 # Projects
 
 <!-- chicken nugget number type things come up when dispensing change -->
-- [Tic-Tac-Toe]()
+- [Tic-Tac-Toe](./projects/tic_tac_toe.md)
 
 
 # Concepts
@@ -458,35 +496,6 @@ Gui stuff
   - [Practice](./code_is_read_more_than_written/practice.md)
 
 
-
-# The Computing Environment
-
-- [Hardware](./hardware.md)
-  - [CPU](./hardware/cpu.md)
-  - [RAM](./hardware/ram.md)
-  - [Hard Drives](./hardware/hard_drives.md)
-  - [Motherboard](./hardware/motherboard.md)
-- [Operating Systems](./operating_systems.md)
-  - [Personal Computers](./operating_systems/personal_computers.md)
-  - [Servers](./operating_systems/servers.md)
-  - [Mobile Phones](./operating_systems/mobile_phones.md)
-  - [Game Consoles](./operating_systems/game_consoles.md)
-  - [Abstractions](./operating_systems/abstractions.md)
-  - [Defaults](./operating_systems/defaults.md)
-- [The Terminal](./the_terminal.md)
-  - [Bash](./the_terminal/bash.md)
-  - [Windows Subsystem for Linux](./the_terminal/windows_subsystem_for_linux.md)
-  - [Chromebooks and School Computers](./the_terminal/chromebooks_and_school_computers.md)
-  - [Commands](./the_terminal/commands.md)
-  - [Directories](./the_terminal/directories.md)
-  - [Listing Files](./the_terminal/listing_files.md)
-  - [Creating Directories](./the_terminal/creating_directories.md)
-  - [Changing Directories](./the_terminal/changing_directories.md)
-  - [Creating Files](./the_terminal/creating_files.md)
-  - [Run Java Programs](./the_terminal/run_java_programs.md)
-  - [Getting Used to it](./the_terminal/getting_used_to_it.md)
-
-
 # Control Flow IV
 
 - [Exceptions II](./exceptions_ii.md)
@@ -551,7 +560,7 @@ Gui stuff
   - [Optimized Implementation](./growable_arrays/optimized_implementation.md)
   - [Challenges](./growable_arrays/challenges.md)
 
-# Interactive Programs II
+# Interactive Programs III
 
 - [Command Line Arguments](./command_line_arguments.md)
   - [Accessing Arguments](./command_line_arguments/accessing_arguments.md)
@@ -613,7 +622,7 @@ Gui stuff
   - [Challenges](./integers_ii/challenges.md)
 
 
-# Interactive Programs III
+# Interactive Programs IV
 
 - [Files](./files.md)
   - [Paths](./files/paths.md)
@@ -874,10 +883,9 @@ Make them do one. -->
   - [Arguments](./lambdas/arguments.md)
   - [Return](./lambdas/return.md)
   - [Method References](./lambdas/method_references.md)
+  - [Constructor References](./lambdas/constructor_references.md)
   - [Inference](./lambdas/inference.md)
   - [Built-In Functional Interfaces](./lambdas/built_in_functional_interfaces.md)
-  - [Runnable](./lambdas/runnable.md)
-  - [Function](./lambdas/function.md)
   - [Checked Exceptions](./lambdas/checked_exceptions.md)
   - [Challenges](./lambdas/challenges.md)
 
@@ -953,7 +961,11 @@ TODO: Wait for hermetic java
   - [Collectors](./streams/collectors.md)
   - [Purpose](./streams/purpose.md)
   - [Challenges](./streams/challenges.md)
+
+
 <!--
+Make a challenge where the solution is to write normal code.
+
 - [Regular Expressions 🚧](./regular_expressions.md)
   - [Theoretical Basis](./regular_expressions/theoretical_basis.md)
   - [Pattern](./regular_expressions/pattern.md)
@@ -964,14 +976,26 @@ TODO: Wait for hermetic java
   - [Matcher]()
   - [Pathological Cases]()
   - [Power]()
+
+# Interactive Programs IV
+
+- [Files II](./files_ii.md)
+  - [List Files](./files_ii/list_files.md)
+  - [Read Lines](./files_ii/read_lines.md)
+  - [InputStream](./files_ii/input_stream.md)
+  - [OutputStream](./files_ii/output_stream.md)
+  - [Reader](./files_ii/reader.md)
+  - [Writer](./files_ii/writer.md)
   -->
 
+
 # Conclusion
 
 - [What Now?](./conclusion/what_now.md)
 
 
 <!-- 
+
 - [Strings III 🚧]()
 
 Streams II
diff --git a/src/conclusion/what_now.md b/src/conclusion/what_now.md
index 77e2c9f..88bb87a 100644
--- a/src/conclusion/what_now.md
+++ b/src/conclusion/what_now.md
@@ -142,12 +142,12 @@ most employable one of the many HTTP server options out there.
 ### Desktop Applications
 
 If you want to learn how to make desktop applications in Java you have basically
-three paths.
+two paths.
 
 Path #1 is to learn Java Swing. This is an old crusty GUI framework that is kinda difficult to use
 but has the pro of coming with Java and being able to run on every potato in existence.
 
-[Docs for `java.desktop` (Swing) here](https://docs.oracle.com/en/java/javase/24/docs/api/jdk.httpserver/module-summary.html)
+[Docs for `java.desktop` (Swing) here](https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/module-summary.html)
 
 Path #2 is the learn JavaFX. By all accounts JavaFX is better software than Swing, but it was cursed
 by coming out at a point in history where desktop apps were no longer big business to develop. It
@@ -187,7 +187,8 @@ learned JavaScript that is a good one to touch next.
 
 There are languages out there like TypeScript that compile to JavaScript -
 and you can find some projects out there that do much the same for Java -
-but just practically speaking learning JavaScript
+but just practically speaking learning JavaScript is going to be something
+you have to do at some point if you get into making websites.
 
 ### C#
 
@@ -226,10 +227,10 @@ you do to make a full app in it, but it can't hurt.
 
 [Kotlin Android Tutorial here](https://kotlinlang.org/docs/android-overview.html)
 
-If you want to make Desktop or Mobile apps in Kotlin it is probably also worth checking out
-Jetpack Compose.
+If you want to make Desktop, Mobile, or Web apps in Kotlin it is probably also worth checking out
+Jetbrains Compose Multiplatfrom.
 
-[Getting Started for Jetpack Compose here](https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-multiplatform-create-first-app.html)
+[Getting Started for Jetbrains Compose Multiplatfrom here](https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-multiplatform-create-first-app.html)
 
 
 ### Others
@@ -261,4 +262,7 @@ context for quite yet:
 
 * Rust
 * Zig
+* Clojure
+
+
 [^wasm]: Fight me, WebAssembly fans.
\ No newline at end of file
diff --git a/src/easy_vs_simple.md b/src/easy_vs_simple.md
new file mode 100644
index 0000000..852ff53
--- /dev/null
+++ b/src/easy_vs_simple.md
@@ -0,0 +1 @@
+# Easy vs. Simple
diff --git a/src/exceptions_ii/unchecked_exceptions.md b/src/exceptions_ii/unchecked_exceptions.md
index d2c6422..065cb88 100644
--- a/src/exceptions_ii/unchecked_exceptions.md
+++ b/src/exceptions_ii/unchecked_exceptions.md
@@ -1,6 +1,6 @@
 # Unchecked Exceptions
 
-When a part of your code might throw a "unchecked" exception, other
+When a part of your code might throw an "unchecked" exception, other
 parts of your code do not need to account for that possibility.
 
 ```java
diff --git a/src/files_ii.md b/src/files_ii.md
new file mode 100644
index 0000000..29ef6dd
--- /dev/null
+++ b/src/files_ii.md
@@ -0,0 +1 @@
+# Files II
diff --git a/src/files_ii/challenges.md b/src/files_ii/challenges.md
new file mode 100644
index 0000000..9358534
--- /dev/null
+++ b/src/files_ii/challenges.md
@@ -0,0 +1 @@
+# Challenges
diff --git a/src/files_ii/input_stream.md b/src/files_ii/input_stream.md
new file mode 100644
index 0000000..446a71c
--- /dev/null
+++ b/src/files_ii/input_stream.md
@@ -0,0 +1 @@
+# InputStream
diff --git a/src/files_ii/lines.md b/src/files_ii/lines.md
new file mode 100644
index 0000000..a294fde
--- /dev/null
+++ b/src/files_ii/lines.md
@@ -0,0 +1 @@
+# Lines
diff --git a/src/files_ii/list_directory.md b/src/files_ii/list_directory.md
new file mode 100644
index 0000000..f3beb89
--- /dev/null
+++ b/src/files_ii/list_directory.md
@@ -0,0 +1 @@
+# Paths
diff --git a/src/files_ii/list_files.md b/src/files_ii/list_files.md
new file mode 100644
index 0000000..5f6e07d
--- /dev/null
+++ b/src/files_ii/list_files.md
@@ -0,0 +1 @@
+# List Files
diff --git a/src/files_ii/list_files_in_a_directory.md b/src/files_ii/list_files_in_a_directory.md
new file mode 100644
index 0000000..f3beb89
--- /dev/null
+++ b/src/files_ii/list_files_in_a_directory.md
@@ -0,0 +1 @@
+# Paths
diff --git a/src/files_ii/output_stream.md b/src/files_ii/output_stream.md
new file mode 100644
index 0000000..3903842
--- /dev/null
+++ b/src/files_ii/output_stream.md
@@ -0,0 +1 @@
+# OutputStream
diff --git a/src/files_ii/paths.md b/src/files_ii/paths.md
new file mode 100644
index 0000000..f3beb89
--- /dev/null
+++ b/src/files_ii/paths.md
@@ -0,0 +1 @@
+# Paths
diff --git a/src/files_ii/read_lines.md b/src/files_ii/read_lines.md
new file mode 100644
index 0000000..6b6a5b5
--- /dev/null
+++ b/src/files_ii/read_lines.md
@@ -0,0 +1 @@
+# Read Lines
diff --git a/src/files_ii/reader.md b/src/files_ii/reader.md
new file mode 100644
index 0000000..284bef6
--- /dev/null
+++ b/src/files_ii/reader.md
@@ -0,0 +1 @@
+# Reader
diff --git a/src/files_ii/writer.md b/src/files_ii/writer.md
new file mode 100644
index 0000000..8e619c4
--- /dev/null
+++ b/src/files_ii/writer.md
@@ -0,0 +1 @@
+# Writer
diff --git a/src/first_steps.md b/src/first_steps.md
index 1292470..bbc9f8a 100644
--- a/src/first_steps.md
+++ b/src/first_steps.md
@@ -4,7 +4,7 @@
 <img src="/first_steps/header.png" height="200px"/>
 
 
-If you made it through the [Getting Started section](./getting_started/hello_world.md) you've successfully run this program.
+If you made it through the ["Set Up Your Computer" section](./text_editors/set_up_your_computer.md) you've successfully run this program.
 
 ```java
 void main() {
@@ -36,7 +36,7 @@ IO.println("Hello, World!");
 
 This bit of magic here - `IO.println` - is a "statement" that "prints" the text inside the `(` and `)` as well as a "new line" to the screen.
 
-**print** with new **l**i**n**e.
+The "`IO`" part stands for "Input/Output" then it is **print** with new **l**i**n**e.
 
 If you were to replace it with `IO.print`, then the output would lack that new line. This makes the following program be functionally identical to the first.
 
diff --git a/src/getting_started.md b/src/getting_started.md
index 01d9a77..26b98e7 100644
--- a/src/getting_started.md
+++ b/src/getting_started.md
@@ -1,6 +1,21 @@
 # Getting Started
 
-There are a lot of ways to "get set up" to run Java code.
+There are a lot of ways to "get set up" to run Java code. 
+
+
+
+For the first chunk of this book it will only matter that you have the
+ability to run Java code. The guides below will be aiming to get you 
+to that point.
+
+After the section 
+
+## Chromebooks / Mobile Phones
+
+
+
+One is to get set up "for real." This means Java is fully set up on your system
+and all the comman
 
 For at least the first chunk of this, you should be able to get away with using
 the editor on [https://run.mccue.dev](https://run.mccue.dev). That might be the easiest.
@@ -21,6 +36,9 @@ Download the "JDK MSI" from [adoptium.net](https://adoptium.net/temurin/releases
 
 Run the installer, selecting all the default options.
 
+Then you should download 
+
+
 ## Mac OS
 
 Download the "JDK .pkg" from [adoptium.net](https://adoptium.net/temurin/releases/?version=25&os=mac).
diff --git a/src/hardware.md b/src/hardware.md
index 0bfef98..e0f646c 100644
--- a/src/hardware.md
+++ b/src/hardware.md
@@ -1,10 +1,10 @@
 # Hardware
 <img src="/hardware/header.png" height="200px"/>
 
-That was a long stretch of Java, so I think you've earned a bit of a detour into
+Before we get into Java, It might be helpful to take a detour into
 general computing knowledge.
 
-I won't be offended if you skim or skip these sections. Depending on who you are,
+I won't be offended if you skim or skip this and the next section. Depending on who you are,
 this might be a bit obvious.
 
 First lets cover hardware. The actual physical components that make up your computer.
\ No newline at end of file
diff --git a/src/interfaces.md b/src/interfaces.md
index 5ad33d7..ec7a73b 100644
--- a/src/interfaces.md
+++ b/src/interfaces.md
@@ -5,7 +5,7 @@
 
 Generics let you write code that doesn't care
 what is different between different things - you would accept a `String`
-or an `Integer`, doesn't matter what is diferent between them.
+or an `Integer`, doesn't matter what is different between them.
 
 Interfaces do a related thing. They let you write code that takes advantage
 of commonalities.
diff --git a/src/lambdas.md b/src/lambdas.md
index 4a5d3aa..3f09174 100644
--- a/src/lambdas.md
+++ b/src/lambdas.md
@@ -12,7 +12,7 @@ interface Band {
     void playHitSong();
 }
 
-class Starcadian implements Bank {
+class Starcadian implements Band {
     @Override
     public void playHitSong() {
         IO.println("ultralove");
diff --git a/src/lambdas/constructor_references.md b/src/lambdas/constructor_references.md
new file mode 100644
index 0000000..8c9225e
--- /dev/null
+++ b/src/lambdas/constructor_references.md
@@ -0,0 +1,25 @@
+# Constructor References
+
+You can make a reference to the constructor
+of a class by using `::new`.
+
+```java,no_run
+// interface Supplier<T> {
+//    T get();
+// }
+
+Supplier<ArrayList<String>> listSupplier =
+    ArrayList::new;
+```
+
+This will try and select a constructor overload that
+matches the method expected on the interface.
+
+If you need to pass arguments to the constructor then
+you should use a regular lambda.
+
+```java,no_run
+Supplier<ArrayList<String>> listSupplier = () -> {
+    return new ArrayList<>(10);
+};
+```
\ No newline at end of file
diff --git a/src/packaging/jar_files.md b/src/packaging/jar_files.md
index 175857f..3f9283e 100644
--- a/src/packaging/jar_files.md
+++ b/src/packaging/jar_files.md
@@ -11,5 +11,5 @@ just that at a high level it's all just files in a ZIP.
 [^compression]: This bundling up also generally includes "compression," where
 the single file might be smaller than the combined sizes of its components. Most people don't
 need to think about this nowadays. Class files are small and hard drives are big.
-I say that knowing full well that 145GB of the 500GB hard drive my work laptop is Baldurs Gate 3.
+I say that knowing full well that 145GB of the 500GB hard drive on my work laptop is Baldurs Gate 3.
 I have 4GB left.
\ No newline at end of file
diff --git a/src/projects/buy_now_pay_later.md b/src/projects/buy_now_pay_later.md
index 85f6f18..3a18913 100644
--- a/src/projects/buy_now_pay_later.md
+++ b/src/projects/buy_now_pay_later.md
@@ -5,7 +5,7 @@
 People exchange money for goods and/or services.
 
 Some of these purchases are non-essential. This means that they are,
-strictly speaking, optional. Ordering extra guacamole at a restraunt,
+strictly speaking, optional. Ordering extra guacamole at a restaurant,
 buying a brand new pair of shoes, and buying a diamond ring are all
 examples of non-essential spending.
 
diff --git a/src/projects/tic_tac_toe.md b/src/projects/tic_tac_toe.md
new file mode 100644
index 0000000..1ed19f2
--- /dev/null
+++ b/src/projects/tic_tac_toe.md
@@ -0,0 +1,48 @@
+# Tic-Tac-Toe
+
+
+## Problem Statement
+
+During the summer between 3rd grade and 4th grade my parents sent me to "baseball camp."
+
+This was because despite playing baseball for three years at that point
+I had only hit the ball twice[^tball]. I was often put in the left outfield position
+where I would pick dandelions. Being literally "left out" made me sad
+but the whole display made my father proud.
+
+Instead of applying myself and learning how to play baseball I had a notebook
+where I wrote out all the different games of tic-tac-toe determined to "crack the code"
+and never lose again. I thought I was being so smart and, in my defense, so did the
+other children. A loser, yes - but smart.
+
+Even today when I go to dinner with my siblings or parents we ask for the kids'
+menu and crayons over 50% of the time. We then
+play at least one game of tic-tac-toe at the table of a nice Italian restaurant[^not].
+
+
+## Your Goal
+
+Make a program that lets you play [tic-tac-toe](https://en.wikipedia.org/wiki/Tic-tac-toe) against the computer.
+
+Make sure that the player is not allowed to make invalid moves, that the computer
+does not make invalid moves, and that the game will not crash on unexpected
+input from the player.
+
+## Future Goals
+
+When you learn enough to do the following, come back to this project and expand it.
+
+* Implement a few different options for the AI including "pick a valid move at random".
+* Allow for setting up simulated matches between the different AIs
+* Expand the game to have the option to play "[ultimate tic-tac-toe](https://en.wikipedia.org/wiki/Ultimate_tic-tac-toe)."[^better]
+* Make the program have a graphical interface and let people click to make a move.
+* Allow for playing with other players over the internet.
+
+
+
+
+[^tball]: Tee Ball excluded.
+
+[^not]: I am not Italian.
+
+[^better]: Ultimate tic-tac-toe is actually a much better game.
\ No newline at end of file
diff --git a/src/streams/challenges.md b/src/streams/challenges.md
index a9b8bac..6ffb3a3 100644
--- a/src/streams/challenges.md
+++ b/src/streams/challenges.md
@@ -15,8 +15,9 @@ import module java.base;
 
 class Main {
     void main() {
-        for (int i = 0; i < 10; i++) {
-            IO.println(i);
+        List<Integer> numbers = List.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        for (int n : numbers) {
+            IO.println(n);
         }
     }
 }
@@ -26,7 +27,7 @@ class Main {
 
 Translate the following code using a for-loop to code using streams.
 
-```java
+```java,editable
 import module java.base;
 
 class Main {
@@ -49,7 +50,7 @@ Read the documentation on [`Collector`](https://docs.oracle.com/en/java/javase/2
 
 Make an implementation of `Collector` that can collect elements into `MySpecialList`.
 
-```java
+```java,editable
 import module java.base;
 
 class MySpecialList<T> extends ArrayList<T> {}
@@ -62,4 +63,9 @@ class Main {
             .collect(/* CODE HERE */);
     }
 }
-```
\ No newline at end of file
+```
+
+<details>
+    <summary> Hint 1 </summary>
+    <p> Look at the `Collector.of` static methods </p>
+</details>
\ No newline at end of file
diff --git a/src/streams/purpose.md b/src/streams/purpose.md
index d6aa1fe..31e702b 100644
--- a/src/streams/purpose.md
+++ b/src/streams/purpose.md
@@ -21,7 +21,7 @@ for (double d : doubles) {
 }
 ```
 
-```java
+```java,no_run
 List<Double> doubles = List.of(1.5, 2.5, 3.9);
 
 List<Double> newDoubles = doubles.stream()
diff --git a/src/streams/terminal_operations.md b/src/streams/terminal_operations.md
index 4e30d03..8cbe2e7 100644
--- a/src/streams/terminal_operations.md
+++ b/src/streams/terminal_operations.md
@@ -9,7 +9,7 @@ For consuming a stream you use "terminal operations." Terminal operations
 The simplest terminal operation is `.forEach`. It consumes the entire stream and does
 something for each element in the flow.
 
-```java,no_run
+```java
 ~void main() {
 List<String> cities = List.of(
     "St. Louis", "Dallas", "London", "Tokyo"
@@ -24,7 +24,7 @@ cities.stream()
 Once a terminal operation has been performed the stream is no longer
 usable.
 
-```java
+```java,panics
 ~void main() {
 List<String> cities = List.of(
     "St. Louis", "Dallas", "London", "Tokyo"
diff --git a/src/text_editors.md b/src/text_editors.md
new file mode 100644
index 0000000..ea65ac5
--- /dev/null
+++ b/src/text_editors.md
@@ -0,0 +1,12 @@
+# Text Editors
+
+Code is written in "text files." These are files that just contain 
+text.
+
+This is different from something like Microsoft Word or the notes app on a phone.
+Those kinds of programs are for "rich text." Meaning you can bold words, change font
+colors, embed images - all sorts of stuff.
+
+Text files only store text.
+
+To create and edit text files we use programs called "text editors."
\ No newline at end of file
diff --git a/src/text_editors/challenges.md b/src/text_editors/challenges.md
new file mode 100644
index 0000000..ae33bad
--- /dev/null
+++ b/src/text_editors/challenges.md
@@ -0,0 +1,2 @@
+# Challenges
+
diff --git a/src/text_editors/chromebooks_and_phones.md b/src/text_editors/chromebooks_and_phones.md
new file mode 100644
index 0000000..a78c592
--- /dev/null
+++ b/src/text_editors/chromebooks_and_phones.md
@@ -0,0 +1 @@
+# Chromebooks and Phones
diff --git a/src/text_editors/codespace_ai.png b/src/text_editors/codespace_ai.png
new file mode 100644
index 0000000..a20d009
Binary files /dev/null and b/src/text_editors/codespace_ai.png differ
diff --git a/src/text_editors/codespace_continue_working.png b/src/text_editors/codespace_continue_working.png
new file mode 100644
index 0000000..41c65e6
Binary files /dev/null and b/src/text_editors/codespace_continue_working.png differ
diff --git a/src/text_editors/codespace_extension_no.png b/src/text_editors/codespace_extension_no.png
new file mode 100644
index 0000000..98cbb3b
Binary files /dev/null and b/src/text_editors/codespace_extension_no.png differ
diff --git a/src/text_editors/codespace_extension_prompt.png b/src/text_editors/codespace_extension_prompt.png
new file mode 100644
index 0000000..61bfb5b
Binary files /dev/null and b/src/text_editors/codespace_extension_prompt.png differ
diff --git a/src/text_editors/codespace_first_view.png b/src/text_editors/codespace_first_view.png
new file mode 100644
index 0000000..ef6931c
Binary files /dev/null and b/src/text_editors/codespace_first_view.png differ
diff --git a/src/text_editors/codespace_ignore_all.png b/src/text_editors/codespace_ignore_all.png
new file mode 100644
index 0000000..a30d11e
Binary files /dev/null and b/src/text_editors/codespace_ignore_all.png differ
diff --git a/src/text_editors/codespace_instance_size.png b/src/text_editors/codespace_instance_size.png
new file mode 100644
index 0000000..c4c44d0
Binary files /dev/null and b/src/text_editors/codespace_instance_size.png differ
diff --git a/src/text_editors/codespace_repo_landing.png b/src/text_editors/codespace_repo_landing.png
new file mode 100644
index 0000000..2c9f89c
Binary files /dev/null and b/src/text_editors/codespace_repo_landing.png differ
diff --git a/src/text_editors/codespace_run_code.png b/src/text_editors/codespace_run_code.png
new file mode 100644
index 0000000..a6ca703
Binary files /dev/null and b/src/text_editors/codespace_run_code.png differ
diff --git a/src/text_editors/codespace_srcmainjava.png b/src/text_editors/codespace_srcmainjava.png
new file mode 100644
index 0000000..e890c93
Binary files /dev/null and b/src/text_editors/codespace_srcmainjava.png differ
diff --git a/src/text_editors/ides.md b/src/text_editors/ides.md
new file mode 100644
index 0000000..218b38f
--- /dev/null
+++ b/src/text_editors/ides.md
@@ -0,0 +1,17 @@
+# IDEs
+
+A term you might have heard or will hear in the future is "IDE."
+
+IDE stands for "Integrated Development Environment." It is basically a text editor
+with a bunch of features "integrated" that ease "development" of software.
+
+Programs like [Eclipse](https://eclipseide.org/), [IntelliJ](https://www.jetbrains.com/idea/), and [Netbeans](https://netbeans.apache.org/front/main/index.html)
+are all considered Java IDEs. This is because they come integrated with
+functionality that makes developing specficially programs in Java easier.
+
+Text editors that have plugins available can often be juiced up enough that they will also
+be considered "IDEs." This is the case for [VSCode](https://code.visualstudio.com/)
+which has two Java plugins as well as plugins which support development in other languages.[^matter]
+
+[^matter]: Now does any of this matter right now? No. I just think its good to not get confused
+or get unneeded FOMO.
\ No newline at end of file
diff --git a/src/text_editors/install_java.md b/src/text_editors/install_java.md
new file mode 100644
index 0000000..8ae284a
--- /dev/null
+++ b/src/text_editors/install_java.md
@@ -0,0 +1,60 @@
+# Install Java
+
+After you've got VSCodium set up the next step 
+is to install Java.[^barebones]
+
+## Chromebooks and School Computers
+
+<details>
+    <summary> Expand </summary>
+
+You can skip this step. The instructions I gave to get set up with Github Codespaces
+should have given you an environment where Java is already set up.
+
+</details>
+
+
+## Windows
+
+<details>
+    <summary> Expand </summary>
+
+Download the "JDK MSI" from [adoptium.net](https://adoptium.net/temurin/releases/?version=25&os=windows).
+Select whatever the newest version is. You will need at least Java 25 to follow along with the
+examples in this book.
+
+Run the installer, selecting all the default options. This should make the `java` command available to
+you. 
+
+</details>
+
+
+## Mac OS
+
+<details>
+    <summary> Expand </summary>
+
+Download the "JDK .pkg" from [adoptium.net](https://adoptium.net/temurin/releases/?version=25&os=mac).
+Select whatever the newest version is. You will need at least Java 25 to follow along with the
+examples in this book.
+
+Run the installer, selecting all the default options. This should make the `java` command available to
+you.
+
+</details>
+
+## Linux
+
+<details>
+    <summary> Expand </summary>
+
+Linux is a little annoying. If you are using it you are likely used to it
+by now, but you can use [adoptium.net](https://adoptium.net/temurin/releases/?version=25&os=linux) like everyone else, but there is no universal installer there.
+
+You can either download the `.tar.gz` file that matches your machine, extract it,
+and add the `bin` folder to your `PATH`, or you can try to find an installer for your
+specific linux distribution.
+
+</details>
+
+[^barebones]: Apologies if you find these instructions a little barebones.
\ No newline at end of file
diff --git a/src/text_editors/install_vscodium.md b/src/text_editors/install_vscodium.md
new file mode 100644
index 0000000..2f41918
--- /dev/null
+++ b/src/text_editors/install_vscodium.md
@@ -0,0 +1,158 @@
+# Install VSCodium
+
+To install VSCodium you need to go to this page:
+
+[https://github.com/VSCodium/vscodium/releases](https://github.com/VSCodium/vscodium/releases).
+
+Then follow the instructions below specific to what kind of computer you have.
+
+## Chromebooks and School Computers
+
+<details>
+    <summary> Expand </summary>
+    <p>Unfortunately the defining characteristic of a Chromebook is that you cannot install
+    "normal" software on it.</p>
+    <p>This is also generally true for computers provided to you by a school. Sometimes they will
+    be okay with you running things normally, sometimes not.</p>
+    <p>For these situations VSCodium is not an option so for now I am going to recommend falling
+    back to using a service called "Github Codespaces." This is a service provided by Microsoft
+    where they let you use VSCode in a web browser.</p>
+    <p> First, <a href="https://github.com/">make an account on Github</a>.</p>
+    <p> Then go to <a href="https://github.com/bowbahdoe/j25-codespace"> https://github.com/bowbahdoe/j25-codespace</a> and press the <code>.</code> key on your keyboard.</p>
+    <img src="/text_editors/codespace_repo_landing.png"></img>
+    <p> After pressing <code>.</code> you should be redirected to a page that looks like this </p>
+    <img src="/text_editors/codespace_first_view.png" />
+    <p> Click the button on the bottom labeled "Continue Working in GitHub Codespaces."</p>
+    <img src="/text_editors/codespace_continue_working.png" />
+    <p> Select the smallest instance size from the dropdown that appears. </p>
+    <img src="/text_editors/codespace_instance_size.png" />
+    <p> After it loads for awhile you will see a pop-up in the bottom left of your screen asking
+    if you want to install an extension for Java files. </p>
+    <img src="/text_editors/codespace_extension_prompt.png" />
+    <p> You want to say no to this. </p>
+    <img src="/text_editors/codespace_extension_no.png" />
+    <p> You will also want to say no to all extension suggestions. </p>
+    <img src="/text_editors/codespace_ignore_all.png" />
+    <p>Next on the chopping block is the AI thing on the right. You want to uncheck the "Show View by Default." option on it then click the `x` to dismiss it.</p>
+    <img src="/text_editors/codespace_ai.png" />
+    <p>After vanquishing evil, your next task is to type `java src/Main.java` into the "Terminal" area at the bottom of your screen.</p>
+    <img src="/text_editors/codespace_srcmainjava.png" />
+    <p>Press the enter key and you should see "Hello, world" be printed out.</p>
+    <img src="/text_editors/codespace_run_code.png" />
+    <p>You can skip the next section on installing Java for now. You are ready to proceed with the book.</p>
+</details>
+    
+
+## Windows
+
+<details>
+    <summary>Expand</summary>
+    <p>If you are on Windows you want to click this link.</p>
+
+<img src="/text_editors/windows_download.png" />
+
+<p>This will download a file. Double click it and it will open an installer like this. Follow it through to the end selecting all the default options</p>
+<img src="/text_editors/windows_installer.png" />
+
+
+<p>When you open the program it installs you should see a screen like this.</p>
+<img src="/text_editors/windows_blank.png" />
+
+<p>In the top-left corner select File -> Open Folder </p>
+<img src="/text_editors/windows_open_folder.png" />
+
+<p>Make a folder somewhere on your computer to store your code. It doesn't matter what you call it.</p>
+<img src="/text_editors/windows_new_folder.png" />
+<img src="/text_editors/windows_naming_folder.png" />
+
+<p>Then make a new file named <code>src/Main.java</code></p>
+<img src="/text_editors/windows_new_file.png" />
+<img src="/text_editors/windows_naming_new_file.png"/>
+
+<p>Inside of this file put the following contents. </p>
+
+```java,no_run
+void main() {
+    IO.println("Hello, world");
+}
+```
+
+<p> Now skip ahead to the next section on installing Java. Come back when you are done. </p>
+
+<p> Once you are back you want to open a new terminal. </p>
+
+<img src="/text_editors/windows_new_terminal.png"/>
+
+<p> Type <code>java src/Main.java</code> in the terminal and press enter to run your first program.
+If this doesn't work you might need to restart your computer or you might have messed up a step.</p>
+
+<img src="/text_editors/windows_run_code.png"/>
+</details>
+
+## MacOS
+
+<details>
+    <summary>Expand</summary>
+    <p>If you have an Apple M1 Mac or newer then you need to scroll down
+to the "ARM 64bits" section (of whatever the newest release is) and click this link.</p>
+
+<img src="/text_editors/mac_arm_download.png" />
+
+<p>If you have an older Mac then you want to click this link.</p>
+
+<img src="/text_editors/mac_x86_download.png" />
+
+<p>This will download a file. Double click it and it will open a window like this.</p>
+<img src="/text_editors/mac_vscodium_dmg_open.png" />
+
+<p>Then drag the VSCodium logo to the Applications folder.</p>
+<img src="/text_editors/mac_vscodium_dmg_drag.png" />
+
+<p>Then you should be able to find and open the app from the Launchpad app.</p>
+
+<img src="/text_editors/mac_launchpad.png" />
+
+<img src="/text_editors/mac_launchpad_vscodium_search.png" />
+
+<p>When you open it you should see a screen like this.</p>
+<img src="/text_editors/mac_blank.png" />
+
+<p>In the top-right corner select File -> Open Folder </p>
+<img src="/text_editors/mac_open_folder.png" />
+
+<p>Make a folder somewhere on your computer to store your code. It doesn't matter what you call it.</p>
+<img src="/text_editors/mac_new_folder.png" />
+
+<p>Then make a new file named <code>src/Main.java</code></p>
+<img src="/text_editors/mac_new_file.png" />
+<img src="/text_editors/mac_make_file.png"/>
+
+<p>Inside of this file put the following contents. </p>
+
+```java,no_run
+void main() {
+    IO.println("Hello, world");
+}
+```
+
+<p> Now skip ahead to the next section on installing Java. Come back when you are done. </p>
+
+<p> Once you are back you want to open a new terminal. </p>
+
+<img src="/text_editors/mac_new_terminal.png"/>
+
+<p> Type <code>java src/Main.java</code> in the terminal and press enter to run your first program.
+If this doesn't work you might need to restart your computer or you might have messed up a step.</p>
+
+<img src="/text_editors/mac_run_java.png"/>
+
+</details>
+
+## Linux
+
+<details>
+    <summary>Expand</summary>
+    <p>Select the installer that matches your system and go from there.</p>
+    <p>Sorry I don't have as nice of a walkthrough as I do for Windows and Mac. In my defense,
+    every Linux machine is its own beast.</p>
+</details
\ No newline at end of file
diff --git a/src/text_editors/mac_arm_download.png b/src/text_editors/mac_arm_download.png
new file mode 100644
index 0000000..d3b7e84
Binary files /dev/null and b/src/text_editors/mac_arm_download.png differ
diff --git a/src/text_editors/mac_blank.png b/src/text_editors/mac_blank.png
new file mode 100644
index 0000000..8a56332
Binary files /dev/null and b/src/text_editors/mac_blank.png differ
diff --git a/src/text_editors/mac_launchpad.png b/src/text_editors/mac_launchpad.png
new file mode 100644
index 0000000..c22d856
Binary files /dev/null and b/src/text_editors/mac_launchpad.png differ
diff --git a/src/text_editors/mac_launchpad_vscodium_search.png b/src/text_editors/mac_launchpad_vscodium_search.png
new file mode 100644
index 0000000..5834d45
Binary files /dev/null and b/src/text_editors/mac_launchpad_vscodium_search.png differ
diff --git a/src/text_editors/mac_make_file.png b/src/text_editors/mac_make_file.png
new file mode 100644
index 0000000..92c941f
Binary files /dev/null and b/src/text_editors/mac_make_file.png differ
diff --git a/src/text_editors/mac_new_file.png b/src/text_editors/mac_new_file.png
new file mode 100644
index 0000000..de7e4e2
Binary files /dev/null and b/src/text_editors/mac_new_file.png differ
diff --git a/src/text_editors/mac_new_folder.png b/src/text_editors/mac_new_folder.png
new file mode 100644
index 0000000..13dd793
Binary files /dev/null and b/src/text_editors/mac_new_folder.png differ
diff --git a/src/text_editors/mac_new_terminal.png b/src/text_editors/mac_new_terminal.png
new file mode 100644
index 0000000..5a9b1f9
Binary files /dev/null and b/src/text_editors/mac_new_terminal.png differ
diff --git a/src/text_editors/mac_open_folder.png b/src/text_editors/mac_open_folder.png
new file mode 100644
index 0000000..be0cceb
Binary files /dev/null and b/src/text_editors/mac_open_folder.png differ
diff --git a/src/text_editors/mac_run_java.png b/src/text_editors/mac_run_java.png
new file mode 100644
index 0000000..f8d2437
Binary files /dev/null and b/src/text_editors/mac_run_java.png differ
diff --git a/src/text_editors/mac_vscodium_dmg_drag.png b/src/text_editors/mac_vscodium_dmg_drag.png
new file mode 100644
index 0000000..6b3cc96
Binary files /dev/null and b/src/text_editors/mac_vscodium_dmg_drag.png differ
diff --git a/src/text_editors/mac_vscodium_dmg_open.png b/src/text_editors/mac_vscodium_dmg_open.png
new file mode 100644
index 0000000..1bc5f6d
Binary files /dev/null and b/src/text_editors/mac_vscodium_dmg_open.png differ
diff --git a/src/text_editors/mac_x86_download.png b/src/text_editors/mac_x86_download.png
new file mode 100644
index 0000000..269c022
Binary files /dev/null and b/src/text_editors/mac_x86_download.png differ
diff --git a/src/text_editors/other_editors.md b/src/text_editors/other_editors.md
new file mode 100644
index 0000000..e225663
--- /dev/null
+++ b/src/text_editors/other_editors.md
@@ -0,0 +1,2 @@
+# Other Editors
+
diff --git a/src/text_editors/set_up_your_computer.md b/src/text_editors/set_up_your_computer.md
new file mode 100644
index 0000000..1851a43
--- /dev/null
+++ b/src/text_editors/set_up_your_computer.md
@@ -0,0 +1,6 @@
+# Set Up Your Computer
+
+Your computer does not come with everything you need to run Java code.
+At least not to start.
+
+Before you proceed further you will need to get your computer set up to do that.
\ No newline at end of file
diff --git a/src/text_editors/visual_studio_code.md b/src/text_editors/visual_studio_code.md
new file mode 100644
index 0000000..c17dd74
--- /dev/null
+++ b/src/text_editors/visual_studio_code.md
@@ -0,0 +1 @@
+# Visual Studio Code
diff --git a/src/text_editors/vscodium.md b/src/text_editors/vscodium.md
new file mode 100644
index 0000000..1341cb3
--- /dev/null
+++ b/src/text_editors/vscodium.md
@@ -0,0 +1,28 @@
+# VSCodium
+
+There are a lot of text editors people use to write programs.
+
+For the purposes of this book I am going to reccomend you use
+one called "[VSCodium](https://vscodium.com/)."
+
+If you have already been introduced to a different text editor
+and want to use it that will be fine. The reasons I am suggesting
+this one are as follows:
+
+* It will not have AI extensions enabled by default.
+* It will not have a Java plugin installed by default.
+* It will work about the same as VSCode, another competent editor.
+
+Now you might read that list and think "why wouldn't I want a Java plugin?"
+
+That is a valid question. The answer is that such plugins are usually made with
+working professional developers as their intended user. The kinds of support
+they provide can be helpful in preventing you from making all sorts of mistakes
+and help you to produce working code quicker.
+
+Somewhat counter-intuitively - and you'll have to take my word for this -
+when you are learning you actually want to be making mistakes and producing
+working code slower. Your primary goal should
+be to acquire a skillset and "bumping into the guard rails"
+is helpful for that.
+
diff --git a/src/text_editors/windows_blank.png b/src/text_editors/windows_blank.png
new file mode 100644
index 0000000..492d2df
Binary files /dev/null and b/src/text_editors/windows_blank.png differ
diff --git a/src/text_editors/windows_download.png b/src/text_editors/windows_download.png
new file mode 100644
index 0000000..380dbbe
Binary files /dev/null and b/src/text_editors/windows_download.png differ
diff --git a/src/text_editors/windows_installer.png b/src/text_editors/windows_installer.png
new file mode 100644
index 0000000..a7a4864
Binary files /dev/null and b/src/text_editors/windows_installer.png differ
diff --git a/src/text_editors/windows_naming_folder.png b/src/text_editors/windows_naming_folder.png
new file mode 100644
index 0000000..c155659
Binary files /dev/null and b/src/text_editors/windows_naming_folder.png differ
diff --git a/src/text_editors/windows_naming_new_file.png b/src/text_editors/windows_naming_new_file.png
new file mode 100644
index 0000000..e9564d2
Binary files /dev/null and b/src/text_editors/windows_naming_new_file.png differ
diff --git a/src/text_editors/windows_new_file.png b/src/text_editors/windows_new_file.png
new file mode 100644
index 0000000..92a039d
Binary files /dev/null and b/src/text_editors/windows_new_file.png differ
diff --git a/src/text_editors/windows_new_folder.png b/src/text_editors/windows_new_folder.png
new file mode 100644
index 0000000..3d26d94
Binary files /dev/null and b/src/text_editors/windows_new_folder.png differ
diff --git a/src/text_editors/windows_new_terminal.png b/src/text_editors/windows_new_terminal.png
new file mode 100644
index 0000000..0051dc6
Binary files /dev/null and b/src/text_editors/windows_new_terminal.png differ
diff --git a/src/text_editors/windows_open_folder.png b/src/text_editors/windows_open_folder.png
new file mode 100644
index 0000000..f111627
Binary files /dev/null and b/src/text_editors/windows_open_folder.png differ
diff --git a/src/text_editors/windows_run_code.png b/src/text_editors/windows_run_code.png
new file mode 100644
index 0000000..be68feb
Binary files /dev/null and b/src/text_editors/windows_run_code.png differ
diff --git a/src/the_terminal/challenges.md b/src/the_terminal/challenges.md
new file mode 100644
index 0000000..9358534
--- /dev/null
+++ b/src/the_terminal/challenges.md
@@ -0,0 +1 @@
+# Challenges
diff --git a/src/time/offset_date_time.md b/src/time/offset_date_time.md
index f49c0e9..07b17ad 100644
--- a/src/time/offset_date_time.md
+++ b/src/time/offset_date_time.md
@@ -60,4 +60,4 @@ class Main {
 }
 ```
 
-[^utc]: UTC stands for "Coordinated Universal Time" in English and "Temps Universel Coordonné" in French. The specific letter order of "UTC" (rather than "CUT" or "TUC") was chosen as a compromise between the two languages.
\ No newline at end of file
+[^utc]: UTC stands for "Coordinated Universal Time" in English and "Temps Universel Coordonné" in French. The specific letter order of "UTC" (rather than "CUT" or "TUC") was chosen as [a compromise between the two languages](https://www.nist.gov/pml/time-and-frequency-division/how-utcnist-related-coordinated-universal-time-utc-international#7114136).
\ No newline at end of file
diff --git a/src/variables.md b/src/variables.md
index 672544e..3b8ed1f 100644
--- a/src/variables.md
+++ b/src/variables.md
@@ -32,3 +32,15 @@ String boss = "Jaqueline";
 IO.println(boss);
 ~}
 ```
+
+You may even use that name to give an initial value to another variable.
+
+```java
+~void main() {
+// Does the same thing as IO.println("Jaqueline");
+String boss = "Jaqueline";
+// You can use variables on the right of the = too.
+String person = boss;
+IO.println(person);
+~}
+```
\ No newline at end of file
diff --git a/src/variables/challenges.md b/src/variables/challenges.md
index 79f00f4..1001e7f 100644
--- a/src/variables/challenges.md
+++ b/src/variables/challenges.md
@@ -63,6 +63,7 @@ void main() {
 }
 ```
 
+<!-- Count not figure out: https://discord.com/channels/272761734820003841/1409741482293858405/1409779369647276074-->
 ## Challenge 4
 
 Only adding lines in the middle and without writing `"A"` or `"B"` again,
@@ -73,6 +74,7 @@ B
 A
 ```
 
+
 ```java,editable
 void main() {
     String a = "A";
@@ -87,6 +89,26 @@ void main() {
 }
 ```
 
+To be clear: you are not allowed to write `b = "A";` or `a = "B";` 
+
+<details>
+    <summary> Hint 1: </summary>
+    <p> You can always make new variables.</p>
+</details>
+
+<details>
+    <summary> Hint 2: </summary>
+    <p> What you need to do is make a "temporary variable" to hold one of the values before you swap them.</p>
+</details>
+
+<details>
+    <summary> Solution </summary>
+    <p><pre>
+String temp = a;
+a = b;
+b = temp;
+</pre></p>
+</details>
 
 ## Challenge 5