update README

Author: alirezadir

README.md

@@ -10,12 +10,12 @@ Welcome to **Agentic-AI-Systems** — a curated and evolving knowledge base for
 
 ## Contents
 
-| Section | Description |
+| Chapter | Description |
 |---------|-------------|
 | **[1. Foundations](./01_foundations/README.md)** | GenAI concepts and design, LLMs, evaluation, modern Python, and more. |
-| **[2. Frameworks](./02_frameworks/README.md)** | Tutorials and example codes for OpenAI, LangGraph, LlamaIndex, LangChain, CrewAI, Chainlit, and more |
-| **[3. System Design](./03_system_design/README.md)** | Architectures, patterns, cognition layers, diagrams, and code |
-| **[4. Use Cases](./04_use_cases/README.md)** | Real-world and example agent projects and applications |
+| **[2. Frameworks](./02_frameworks/README.md)** | Tutorials and example codes for OpenAI, LangGraph, LlamaIndex, LangChain, CrewAI, Chainlit, and more. |
+| **[3. System Design](./03_system_design/README.md)** | Agentic AI System Design: Architectures, layers, design patterns, diagrams, and code. |
+| **[4. Use Cases](./04_use_cases/README.md)** | Real-world and example agent projects and applications. |
 | **[5. Resources](./05_resources/resources.md)** | Courses, tool stacks, protocols, and list of resources. |
 
 ---