LangChain Quickstart: Build Powerful LLM (ChatGPT/GPT4) Applications

Learn the basics of LangChain in Python

Venelin Valkov
7 min readMay 9, 2023

Ready to quickly start with LangChain? In this tutorial, you’ll learn the basics of LangChain and how to get started with building powerful apps using OpenAI and ChatGPT. We’ll start by setting up a Google Colab notebook and running a simple OpenAI model. Then, we’ll dive deeper by loading an external webpage and using LangChain to ask questions using OpenAI embeddings and ChatGPT.

Finally, we’ll explore prompt templates and chains, and combine all the components we’ve learned to create a powerful retrieval-based question-answering system. By the end of this tutorial, you’ll have a solid understanding of LangChain and how to use it to build your own language models. So let’s get started!

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