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+++ b/mkdocs.yml
@@ -52,17 +52,20 @@ nav:
       - 每个系统程序员都应该了解的并发知识: 
         - 【英文】What every systems programmer should know about concurrency: what-should-you-know/concurrency-primer.pdf
         - 【中文】每个系统程序员都应该了解的并发知识: https://www.bilibili.com/read/cv26734224
-  - Jupyter:
-    - Go-Frameworks-Github-Fork-Stats: jupyter/Go-Frameworks-Github-Fork-Stats.ipynb
-    - Pandas完全指南: jupyter/Pandas完全指南.ipynb
-    - Spark上手示例:
-      - jupyter/Spark上手示例1：RDD操作.ipynb
-      - jupyter/Spark上手示例2：DataFrame操作.ipynb
-  - 视频:
-    - 操作系统: video/os.md
-    - 数据结构与算法: video/Data structures.md
-    - C/C++: video/c_c++.md
-    - Go: video/Go.md
+  - Jupyter/视频/PPT:
+    - Jupyter:
+      - Go-Frameworks-Github-Fork-Stats: jupyter/Go-Frameworks-Github-Fork-Stats.ipynb
+      - Pandas完全指南: jupyter/Pandas完全指南.ipynb
+      - Spark上手示例:
+        - jupyter/"Spark上手示例1：RDD操作.ipynb"
+        - jupyter/"Spark上手示例2：DataFrame操作.ipynb"
+    - 视频:
+      - 操作系统: video/os.md
+      - 数据结构与算法: video/Data structures.md
+      - C/C++: video/c_c++.md
+      - Go: video/Go.md
+    - PPT:
+      - Go语言简介: assets/ppt/Golang简介.pdf
   - QA:
     - redis: qa/redis.md
     - mysql: qa/mysql.md