diff --git a/_config.yml b/_config.yml
index 1aedd1c..ffc7378 100644
--- a/_config.yml
+++ b/_config.yml
@@ -1,3 +1,13 @@
 title: Streamcode9 Blog
 description: A space for sharing code experiments and musical riffs.
 theme: minima
+
+plugins:
+  - jekyll-archives
+
+jekyll-archives:
+  enabled:
+    - categories
+  layout: archive
+  permalinks:
+    category: /category/:name/
diff --git a/_posts/2024-01-01-games.md b/_posts/2024-01-01-games.md
index 90feb03..795f948 100644
--- a/_posts/2024-01-01-games.md
+++ b/_posts/2024-01-01-games.md
@@ -1,3 +1,7 @@
+---
+categories: [games]
+---
+
 ## Sports & Tabletop
 - **Chess**
 - Go
diff --git a/_posts/2024-01-02-science.md b/_posts/2024-01-02-science.md
index 18727bf..d8fa760 100644
--- a/_posts/2024-01-02-science.md
+++ b/_posts/2024-01-02-science.md
@@ -1,3 +1,7 @@
+---
+categories: [science]
+---
+
 ### Mathematics
 - **[Math](https://github.com/streamcode9/os/blob/main/math.md)**
 - c. 300 BCE – Euclid writes Elements, a foundational text in geometry and logical deduction.
diff --git a/_posts/2024-01-03-countries.md b/_posts/2024-01-03-countries.md
index ddd863e..5016839 100644
--- a/_posts/2024-01-03-countries.md
+++ b/_posts/2024-01-03-countries.md
@@ -1,3 +1,7 @@
+---
+categories: [countries]
+---
+
 * norway
 * danmark
 * sweeden
diff --git a/_posts/2024-01-04-philosophy.md b/_posts/2024-01-04-philosophy.md
index 7073231..859ed70 100644
--- a/_posts/2024-01-04-philosophy.md
+++ b/_posts/2024-01-04-philosophy.md
@@ -1,3 +1,7 @@
+---
+categories: [philosophy]
+---
+
 * Escapism
   * [Ukulele](/2024/07/12/ukulele.html)
   * [Music theory](/2024/11/05/music-theory.html)
diff --git a/_posts/2024-01-05-cinema.md b/_posts/2024-01-05-cinema.md
index c62035a..f859d3b 100644
--- a/_posts/2024-01-05-cinema.md
+++ b/_posts/2024-01-05-cinema.md
@@ -1,3 +1,7 @@
+---
+categories: [cinema]
+---
+
 * wednesday
 * marvel & dc
 * The day of the Jackal
diff --git a/_posts/2024-01-06-Karl-Marx.md b/_posts/2024-01-06-Karl-Marx.md
index 1d81f63..81eaea1 100644
--- a/_posts/2024-01-06-Karl-Marx.md
+++ b/_posts/2024-01-06-Karl-Marx.md
@@ -1,3 +1,7 @@
+---
+categories: [karl-marx]
+---
+
 Суть марксизма заключается в анализе общества, экономики и истории через призму классовой борьбы. Марксизм утверждает, что история человечества — это история борьбы между эксплуатируемыми и эксплуататорами, а основой общества является способ производства (экономическая база), который определяет политическую и идеологическую надстройку.  
 
 Основные идеи марксизма:  
diff --git a/_posts/2024-01-07-Ivan-Pavlov.md b/_posts/2024-01-07-Ivan-Pavlov.md
index 749c0cf..f13acdc 100644
--- a/_posts/2024-01-07-Ivan-Pavlov.md
+++ b/_posts/2024-01-07-Ivan-Pavlov.md
@@ -1,3 +1,7 @@
+---
+categories: [ivan-pavlov]
+---
+
 Суть работ Ивана Петровича Павлова заключается в изучении физиологии пищеварения и механизмов высшей нервной деятельности, особенно условных рефлексов.  
 
 1. **Исследования пищеварения**: Павлов получил Нобелевскую премию по физиологии и медицине (1904) за изучение работы пищеварительной системы. Он подробно описал роль слюнных, желудочных и кишечных желез, используя метод фистул — хирургически созданных отверстий в органах животных.  
diff --git a/_posts/2024-01-08-epub-fb2.md b/_posts/2024-01-08-epub-fb2.md
index c71f524..c8e9d01 100644
--- a/_posts/2024-01-08-epub-fb2.md
+++ b/_posts/2024-01-08-epub-fb2.md
@@ -1,3 +1,7 @@
+---
+categories: [epub-fb2]
+---
+
 FB2 и EPUB – это форматы электронных книг, но у них есть отличия:  
 
 ### **FB2 (FictionBook 2.0)**  
diff --git a/_posts/2024-01-09-taiji-double-weight.md b/_posts/2024-01-09-taiji-double-weight.md
index 9805be1..86a79ec 100644
--- a/_posts/2024-01-09-taiji-double-weight.md
+++ b/_posts/2024-01-09-taiji-double-weight.md
@@ -1,3 +1,7 @@
+---
+categories: [taiji-double-weight]
+---
+
 The **"double weight" (雙重, shuāng zhòng) or "double weighted"** principle in Taijiquan (Tai Chi Chuan) is a concept often mentioned in classical Taiji theory but widely misunderstood. The phrase appears in texts like the *Taijiquan Classics*, which state:  
 
 *"The root of the disease of double weighting is that the movement is not understood. If one does not know how to distinguish full and empty, then one’s steps will be heavy and sluggish."*  
diff --git a/_posts/2024-06-30-literature.md b/_posts/2024-06-30-literature.md
index a7e22fd..e10d5ba 100644
--- a/_posts/2024-06-30-literature.md
+++ b/_posts/2024-06-30-literature.md
@@ -1,3 +1,7 @@
+---
+categories: [literature]
+---
+
 * bulgakov
 * strugatskie
 * Conan Doyle
diff --git a/_posts/2024-07-01-origami.md b/_posts/2024-07-01-origami.md
index 999cc0f..5d553e8 100644
--- a/_posts/2024-07-01-origami.md
+++ b/_posts/2024-07-01-origami.md
@@ -1,3 +1,7 @@
+---
+categories: [origami]
+---
+
 # Origami Learning Path: From Beginner to Master
 
 ## Level 1: Foundation
diff --git a/_posts/2024-07-02-music.md b/_posts/2024-07-02-music.md
index 7b65b33..2c43a36 100644
--- a/_posts/2024-07-02-music.md
+++ b/_posts/2024-07-02-music.md
@@ -1,3 +1,7 @@
+---
+categories: [music]
+---
+
 * Paganini
 * Billie Eilish
 * Math rock
diff --git a/_posts/2024-07-03-art.md b/_posts/2024-07-03-art.md
index acf864a..4ebca01 100644
--- a/_posts/2024-07-03-art.md
+++ b/_posts/2024-07-03-art.md
@@ -1,3 +1,7 @@
+---
+categories: [art]
+---
+
 * Picasso
 * Breigel
 * Bosh
diff --git a/_posts/2024-07-04-anime.md b/_posts/2024-07-04-anime.md
index 417f142..7d40c04 100644
--- a/_posts/2024-07-04-anime.md
+++ b/_posts/2024-07-04-anime.md
@@ -1,3 +1,7 @@
+---
+categories: [anime]
+---
+
 ### Level 1: The Curious Newcomer
 - **Goal**: Discover anime and understand what it is.
 - **Actions**:
diff --git a/_posts/2024-07-05-bike.md b/_posts/2024-07-05-bike.md
index 3c2f269..a52b421 100644
--- a/_posts/2024-07-05-bike.md
+++ b/_posts/2024-07-05-bike.md
@@ -1,3 +1,7 @@
+---
+categories: [bike]
+---
+
 * Specialized: Known for the iconic Stumpjumper, they offer versatile bikes for all disciplines, from cross-country to downhill, with cutting-edge tech like adjustable geometry.
 * Trek: A giant in the industry, Trek’s Fuel EX is a do-it-all trail bike. They’re reliable, widely available, and back their frames with a lifetime warranty.
 * Santa Cruz: Loved for fun, durable bikes like the Tallboy, they excel in trail and downhill with premium carbon frames.
diff --git a/_posts/2024-07-11-health.md b/_posts/2024-07-11-health.md
index c5b6904..d0f4fcc 100644
--- a/_posts/2024-07-11-health.md
+++ b/_posts/2024-07-11-health.md
@@ -1,5 +1,6 @@
 ---
 title: Health
+categories: [health]
 ---
 
 
diff --git a/_posts/2024-07-12-ukulele-2.md b/_posts/2024-07-12-ukulele-2.md
index c193391..5565b53 100644
--- a/_posts/2024-07-12-ukulele-2.md
+++ b/_posts/2024-07-12-ukulele-2.md
@@ -1,3 +1,7 @@
+---
+categories: [ukulele-2]
+---
+
 # Ukulele Self-Study Program: The Roy Smeck Method
 
 ## Beginner Phase (Weeks 1-4)
diff --git a/_posts/2024-07-12-ukulele.md b/_posts/2024-07-12-ukulele.md
index e17f5c2..fec61a7 100644
--- a/_posts/2024-07-12-ukulele.md
+++ b/_posts/2024-07-12-ukulele.md
@@ -1,5 +1,6 @@
 ---
 title: Ukulele
+categories: [ukulele]
 ---
 
 2013 Hora soprano
diff --git a/_posts/2024-11-04-zemfira.md b/_posts/2024-11-04-zemfira.md
index d03369b..b355cda 100644
--- a/_posts/2024-11-04-zemfira.md
+++ b/_posts/2024-11-04-zemfira.md
@@ -1,3 +1,7 @@
+---
+categories: [zemfira]
+---
+
 01. Бесконечность
 02. Трафик
 03. Кто?
diff --git a/_posts/2024-11-05-music-theory.md b/_posts/2024-11-05-music-theory.md
index 2fe4fe0..b708f3c 100644
--- a/_posts/2024-11-05-music-theory.md
+++ b/_posts/2024-11-05-music-theory.md
@@ -1,5 +1,6 @@
 ---
 title: Music theory
+categories: [music-theory]
 ---
 
 ## Music theory
diff --git a/_posts/2025-01-05-taijiquan-40-levels.md b/_posts/2025-01-05-taijiquan-40-levels.md
index 3652839..9f57579 100644
--- a/_posts/2025-01-05-taijiquan-40-levels.md
+++ b/_posts/2025-01-05-taijiquan-40-levels.md
@@ -1,3 +1,7 @@
+---
+categories: [taijiquan-40-levels]
+---
+
 Here’s a **structured 40-level self-training routine** for progressing
 from complete beginner to a **Chen-style Taijiquan master**.
 The path is divided into **five phases** (8 levels each),
diff --git a/_posts/2025-01-06-taijiquan.md b/_posts/2025-01-06-taijiquan.md
index 3a631c5..cf2dd58 100644
--- a/_posts/2025-01-06-taijiquan.md
+++ b/_posts/2025-01-06-taijiquan.md
@@ -1,3 +1,7 @@
+---
+categories: [taijiquan]
+---
+
 ## Term
 Taijiquan - is an ancient Chinese martial art. Initially developed for combat and self-defense, for most practitioners it has evolved into a sport and form of exercise.
 
diff --git a/_posts/2025-01-28-hus.md b/_posts/2025-01-28-hus.md
index 8b0f9b5..15c8717 100644
--- a/_posts/2025-01-28-hus.md
+++ b/_posts/2025-01-28-hus.md
@@ -1 +1,5 @@
+---
+categories: [hus]
+---
+
 * https://www.rutledalelektro.no/
diff --git a/_posts/2025-04-04-chen.md b/_posts/2025-04-04-chen.md
index 8d20437..e6f816b 100644
--- a/_posts/2025-04-04-chen.md
+++ b/_posts/2025-04-04-chen.md
@@ -1,3 +1,7 @@
+---
+categories: [chen]
+---
+
 # Comprehensive Self-Study Program for Chen-Style Taijiquan
 
 ## Introduction
diff --git a/_posts/2025-04-05-mltt-72.md b/_posts/2025-04-05-mltt-72.md
index 3be2a28..6b419e0 100644
--- a/_posts/2025-04-05-mltt-72.md
+++ b/_posts/2025-04-05-mltt-72.md
@@ -1,3 +1,7 @@
+---
+categories: [mltt-72]
+---
+
 To start learning MLTT-72 (Martin-Löf Type Theory from 1972), you'll need a minimal foundation in:
 
 1. Basic mathematical logic - understanding of logical connectives, quantifiers, and proof techniques
diff --git a/_posts/2025-04-05-mtg-pauper.md b/_posts/2025-04-05-mtg-pauper.md
index 3f65d6a..ac0c625 100644
--- a/_posts/2025-04-05-mtg-pauper.md
+++ b/_posts/2025-04-05-mtg-pauper.md
@@ -1,3 +1,7 @@
+---
+categories: [mtg-pauper]
+---
+
 The idea behind **Pauper** is simple but brilliant:  
 **"Only common cards allowed."**
 
diff --git a/_posts/2025-04-05-organizing-knowledge.md b/_posts/2025-04-05-organizing-knowledge.md
index 9902604..e8d5541 100644
--- a/_posts/2025-04-05-organizing-knowledge.md
+++ b/_posts/2025-04-05-organizing-knowledge.md
@@ -1,3 +1,7 @@
+---
+categories: [organizing-knowledge]
+---
+
 
 ---
 
diff --git a/index.md b/index.md
index 642fc5f..d39ff72 100644
--- a/index.md
+++ b/index.md
@@ -37,3 +37,4 @@ Universe and Everything
 
 Misc
 * [Latest posts](/pages/blog)
+* [Categories](/pages/categories)
diff --git a/pages/categories.md b/pages/categories.md
new file mode 100644
index 0000000..281a83a
--- /dev/null
+++ b/pages/categories.md
@@ -0,0 +1,13 @@
+---
+title: categories
+---
+
+<h1>Categories</h1>
+{% for category in site.categories %}
+## {{ category[0] }}
+<ul>
+  {% for post in category[1] %}
+  <li><a href="{{ post.url }}">{{ post.title }}</a></li>
+  {% endfor %}
+</ul>
+{% endfor %}