GPT-4 and ChatGPT for Apps Source Parts Chapter 2. A Deep Dive into the GPT-4 and ChatGPT APIs Chapter 4. Advanced GPT-4 and ChatGPT Techniques Chapter 1. GPT-4 and ChatGPT Essentials Chapter 3. Building Apps with GPT-4 and ChatGPT Chapter 5. Advancing LLM Capabilities with the LangChain Framework and Plug-ins