diff --git a/book/01-introduction/sections/help.asc b/book/01-introduction/sections/help.asc
index 7c1efb77c..9bde51aa7 100644
--- a/book/01-introduction/sections/help.asc
+++ b/book/01-introduction/sections/help.asc
@@ -17,7 +17,7 @@ $ git help config
 ----
 
 These commands are nice because you can access them anywhere, even offline.
-If the manpages and this book aren't enough and you need in-person help, you can try the `#git` or `#github` channel on the Freenode IRC server, which can be found at https://freenode.net/[].
+If the manpages and this book aren't enough and you need in-person help, you can try the `#git` or `#github` channel on the Freenode IRC server, which can be found at https://freenode.net[].
 These channels are regularly filled with hundreds of people who are all very knowledgeable about Git and are often willing to help.(((IRC)))
 
 In addition, if you don't need the full-blown manpage help, but just need a quick refresher on the available options for a Git command, you can ask for the more concise ``help'' output with the `-h` or `--help` options, as in:
diff --git a/book/01-introduction/sections/installing.asc b/book/01-introduction/sections/installing.asc
index e84adde2e..895b5b21c 100644
--- a/book/01-introduction/sections/installing.asc
+++ b/book/01-introduction/sections/installing.asc
@@ -29,7 +29,7 @@ If you're on a Debian-based distribution, such as Ubuntu, try `apt`:
 $ sudo apt install git-all
 ----
 
-For more options, there are instructions for installing on several different Unix distributions on the Git website, at http://git-scm.com/download/linux[].
+For more options, there are instructions for installing on several different Unix distributions on the Git website, at https://git-scm.com/download/linux[].
 
 ==== Installing on macOS
 
@@ -53,14 +53,14 @@ image::images/git-osx-installer.png[Git macOS installer.]
 
 You can also install it as part of the GitHub for Mac install.
 Their GUI Git tool has an option to install command line tools as well.
-You can download that tool from the GitHub for Mac website, at http://mac.github.com[].
+You can download that tool from the GitHub for Mac website, at https://desktop.github.com[].
 
 ==== Installing on Windows
 
 There are also a few ways to install Git on Windows.(((Windows, installing)))
 The most official build is available for download on the Git website.
-Just go to http://git-scm.com/download/win[] and the download will start automatically.
-Note that this is a project called Git for Windows, which is separate from Git itself; for more information on it, go to https://git-for-windows.github.io/[].
+Just go to https://git-scm.com/download/win[] and the download will start automatically.
+Note that this is a project called Git for Windows, which is separate from Git itself; for more information on it, go to https://gitforwindows.org[].
 
 To get an automated installation you can use the https://chocolatey.org/packages/git[Git Chocolatey package].
 Note that the Chocolatey package is community maintained.
@@ -69,7 +69,7 @@ Another easy way to get Git installed is by installing GitHub Desktop.
 The installer includes a command line version of Git as well as the GUI.
 It also works well with PowerShell, and sets up solid credential caching and sane CRLF settings.(((PowerShell)))(((CRLF)))(((credential caching)))
 We'll learn more about those things a little later, but suffice it to say they're things you want.
-You can download this from the https://desktop.github.com/[GitHub Desktop website].
+You can download this from the https://desktop.github.com[GitHub Desktop website].
 
 ==== Installing from Source