Building AI and LLM Applications with LangChain and LangGraph

In the fast-evolving world of AI, generative models are reshaping how we interact with technology. This tutorial dives into large language models (LLMs) like GPT-4, providing developers, researchers, and AI enthusiasts with the tools to understand and harness their power. Explore deep learning, see how unstructured data comes alive, and discover the transformative impact of LLMs on businesses, society, and everyday life.

Blending theory with practical, code-rich examples, this guide makes complex concepts accessible—whether you’re new to AI or a seasoned developer. It unveils the architecture, applications, and implications of LLMs, equipping you to apply them creatively and responsibly. Step into the generative AI journey and position yourself at the forefront of this exciting technological evolution.

Who This Tutorial Is For


This tutorial is for developers, researchers, and AI enthusiasts eager to explore large language models (LLMs). Written in a clear, practical style with hands-on code examples, it’s suitable for beginners and experienced developers alike. Whether you want to master LLMs or stay ahead with LangChain, this guide is a valuable resource.

What This Tutorial Covers

This tutorial provides a complete, end-to-end guide to building modern applications powered by large language models. It covers:

  • LLM Fundamentals with LangChain
    Learn how to set up LangChain, work with LLMs, design reusable prompts, structure outputs, and compose LLM applications using both imperative and declarative approaches.
  • Retrieval-Augmented Generation (RAG), Part I: Indexing Your Data
    Understand embeddings, text chunking, vector stores, and indexing strategies. Explore advanced retrieval techniques such as MultiVectorRetriever, RAPTOR, and ColBERT.
  • Retrieval-Augmented Generation (RAG), Part II: Chatting with Your Data
    Build systems that retrieve relevant context and generate accurate responses. Dive into query transformation, routing strategies, RAG-Fusion, and text-to-SQL workflows.
  • Memory and State with LangGraph
    Add memory to chatbots by building stateful systems. Learn how to manage, trim, filter, and merge conversation history using LangGraph.
  • Cognitive and Agent Architectures
    Explore multiple cognitive architectures, including chains, routers, and agents. Implement plan-do loops, tool-calling agents, and multi-agent systems with supervision and reflection.
  • Advanced LLM Patterns
    Apply best-practice patterns such as structured outputs, intermediate reasoning, streaming responses, human-in-the-loop workflows, and multitasking LLMs.
  • Deployment and Production Readiness
    Learn how to deploy LLM applications using LangGraph Platform and LangSmith. Cover backend APIs, vector stores, security, and production infrastructure.
  • Testing, Evaluation, and Monitoring
    Define evaluation criteria, create datasets, run regression tests, trace production behavior, monitor performance, and continuously improve LLM applications.
  • Real-World Applications of LLMs
    Build interactive chatbots, collaborative editing tools, and ambient computing experiences that demonstrate how LLMs can be applied in practical, impactful ways.

By the end of this tutorial, you will have a deep understanding of how LLMs work, how to design intelligent systems around them, and how to deploy, evaluate, and scale AI applications responsibly in real-world environments.