Tutorials

New to LangChain or LLM app development in general? Read this material to quickly get up and running.

Basics

• LLM applications: Build and deploy a simple LLM application.
• Chatbots: Build a chatbot that incorporates memory.
• Vector stores: Build vector stores and use them to retrieve data.
• Agents: Build an agent that interacts with external tools.

Working with external knowledge

• Retrieval Augmented Generation (RAG): Build an application that uses your own documents to inform its responses.
• Conversational RAG: Build a RAG application that incorporates a memory of its user interactions.
• Question-Answering with SQL: Build a question-answering system that executes SQL queries to inform its responses.
• Query Analysis: Build a RAG application that analyzes questions to generate filters and other structured queries.
• Local RAG: Build a RAG application using LLMs running locally on your machine.
• Question-Answering with Graph Databases: Build a question-answering system that queries a graph database to inform its responses.
• Question-Answering with PDFs: Build a question-answering system that ingests PDFs and uses them to inform its responses.

Specialized tasks

• Extraction: Extract structured data from text and other unstructured media.
• Synthetic data: Generate synthetic data using LLMs.
• Classification: Classify text into categories or labels.
• Summarization: Generate summaries of (potentially long) texts.

LangGraph

LangGraph is an extension of LangChain aimed at building robust and stateful multi-actor applications with LLMs by modeling steps as edges and nodes in a graph.

LangGraph documentation is currently hosted on a separate site. You can peruse LangGraph tutorials here.

LangSmith

LangSmith allows you to closely trace, monitor and evaluate your LLM application. It seamlessly integrates with LangChain, and you can use it to inspect and debug individual steps of your chains as you build.

LangSmith documentation is hosted on a separate site. You can peruse LangSmith tutorials here.

Evaluation

LangSmith helps you evaluate the performance of your LLM applications. The tutorial below is a great way to get started:

• Evaluate your LLM application

More

For more tutorials, see our cookbook section.