docs: update reference

shipengqi · shipengqi · commit ab47f36f4e8b · 2025-07-11T12:00:06.000+08:00
diff --git a/README.md b/README.md
@@ -2,6 +2,14 @@
 
 Database learning ...
 
+## 主要内容
+
+### MySQL
+
+### Redis
+
+### MongoDB
+
 ## 开始阅读
 
 - [GitHub 在线](https://shipengqi.github.io/db-learn)
diff --git a/content/_index.md b/content/_index.md
@@ -21,6 +21,8 @@ title: Database learning
 
 ## 推荐和参考
 
+- MySQL 实战宝典
 - SQL 必知必会
+- 从根上理解 MySQL
 - Redis 深度历险
 - Redis 设计与实现
