diff --git a/00. Inbox/00. Inbox/Modern C++ The good parts.md b/00. Inbox/00. Inbox/Modern C++ The good parts.md
index 416174b..79347da 100644
--- a/00. Inbox/00. Inbox/Modern C++ The good parts.md	
+++ b/00. Inbox/00. Inbox/Modern C++ The good parts.md	
@@ -1,7 +1,16 @@
-1. Use std::shared_ptr & std::unique_ptr
+1. Use std::shared_ptr & std::unique_ptr & std::weak_ptr
 2. Use std::array or std::vector
 3. Use structured binding & std::tuple
 4. Use for (auto& elem : collector)
 5. Use std::format
 6. Use std::optional
-7. 
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+7. Use auto for return type
+8. Use auto in variable declaration
+9. Use `using` to replace `#define`
+10. Use "Lambda expression" and std::function
+11. `[[deprecated]]` attribute
+12. Maybe...std::any?
+13. And more, constexpr, concept, 
+
+## Reference
+- [AnthonyCalandra/modern-cpp-features: A cheatsheet of modern C++ language and library features.](https://github.com/AnthonyCalandra/modern-cpp-features)
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