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LangChain and LangGraph Crash Course (Udemy.com)

Fast track to building OpenAI LLM powered Apps using Python

Created by: Greg Lim

Last updated April 2026

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What you will learn

  • Learn key LangChain features like connecting to OpenAI LLMs, Prompt Templates, Chains, Document Loaders, Agents, Memory
  • Learn how to build a Medium Article Generator and a Question & Answer Document Chatbot
  • Build practical hands-on project without all the fluff
  • Learn LangChain even if you are a beginner in a weekend

How it compares

Against the other 815 rated Udemy courses in Web Development on CourseDuck:

  • Rating4.6 out of 5higher than 70% of them
  • Reviews5,612#39 of 816 by number of reviews
  • Length3.4 hoursshorter than 75% of them
  • Last updatedApril 2026more recently than 82% of them

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Course Description

In this short course, we take you on a fun, hands-on and pragmatic journey to learn how to build LLM powered apps using LangChain and LangGraph. You'll start building your first Generative AI app within minutes. Every section is recorded in a bite-sized manner and straight to the point as I don’t want to waste your time (and most certainly mine) on the content you don't need.

In this course, we will cover:

  • What is LangChain

  • How does LangChain Work

  • Installation, Setup and Our First LangChain App

  • Building a Medium Article Generator App

  • Connecting to OpenAI LLM

  • Prompt Templates

  • Simple Chains

  • Sequential Chains

  • Agents

  • Chat with a Document

  • Adding Memory (Chat History)

  • Outputting the Chat History

  • Uploading Custom Documents

  • Loading Different Document Types (eg PDF, txt, docs)

  • Chat with Youtube

* New LangGraph Section!

  • Multiple Inputs Graph

  • Conditional Graph

  • Simple AI Agent Bot

  • Agent with Conversation History

  • Reasoning and Acting (ReAct) Agent

  • Task List Assistant Agent

  • RAG Agent

  • and more...

The goal of this course is to teach you LangChain and LangGraph development in a manageable way without overwhelming you. We focus only on the essentials and cover the material in a hands-on practice manner for you to code along.

Working Through This Course

This course is purposely broken down into short sections where the development process of each section will center on different essential topics. The course a practical hands on approach to learning through practice. You learn best when you code along with the examples.

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Instructor Details

Greg Lim

Greg Lim authors many best selling programming books. The books written include:

Beginning Angular with Typescript
Beginning React
Beginning Ethereum and Solidity Decentralised App Development
Beginning iOS 16 & Swift App Development
Beginning Node.js, Express & MongoDB Development
and many more.

With many years of teaching experience at varsity level, he places special emphasis on learning by doing.

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Reviews

4.6

5,612 ratings on Udemy

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By Anonymized User on 6/20/2026

very useful and informative

By Anonymized User on 6/9/2026

Many useful practical examples.

By Christian Klitscher on 5/18/2026

er ist inhaltlich sehr gut, aber die Erklärungen sind teilweise sehr kurz und schnell. Leider sind auch nicht alle erstellten Sourcen als Download verfügbar.

By Aman Singh on 4/13/2026

Its best course for langchain course

By Anonymized User on 3/19/2026

Excellent explanation! He kept everything very simple and used easy examples to make LangChain easy to understand. Highly recommend!

By Anonymized User on 2/27/2026

completely irrelevant to my role at Cognizant, waste of my time

By Huy Vuong on 2/27/2026

The videos are very clear and easy to following. it's a good introduction to the langchain + LLM. I enjoyed it. It made me want to learn more about langchain.

By Anonymized User on 2/26/2026

Useful information to proceed further practice.

By Anonymized User on 2/23/2026

Explanation is good

By Anonymized User on 11/12/2025

Very interesting and so much helpful!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Read all 5,612 reviews on Udemy

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Overall Score : 92 / 100