Learn how to build an AI RAG (Retrieval Augmented Generation) application using LangChain and Next.js in this comprehensive 34-minute tutorial. Explore the fundamentals of RAG and LangChain, set up your development environment with necessary dependencies, and progress through a series of practical examples. Start with a simple chat implementation, then advance to more complex scenarios including chat with history, personality-driven conversations, and RAG pattern chats using JSON objects and files. Gain hands-on experience with OpenAI API integration, frontend chat component development, and the implementation of various LangChain features to enhance your AI application's capabilities.