# Part 3: Frameworks in Practice

> 🛠️ Build Agents quickly with mainstream frameworks — from LangChain to LangGraph, with a cross-framework comparison.

This part contains 3 chapters to help you master the most commonly used Agent development frameworks in the industry.

| Chapter | Content | Key Takeaway |
|---------|---------|-------------|
| **Chapter 11** LangChain in Depth | Architecture, Chain, Agent, LCEL | Master the most popular Agent framework |
| **Chapter 12** LangGraph | Graph structure, state management, human-in-the-loop | Build complex stateful Agents |
| **Chapter 13** Other Frameworks Overview | AutoGPT, CrewAI, AutoGen, Dify | Comprehensive understanding of the framework ecosystem |

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*Start learning: [Chapter 11: LangChain in Depth](./chapter_langchain/README.md)*