krishnaik06/Langchain-V1-Crash-Course ? reverse-engineered prompt

Build me a simple learning project that teaches the basics of LangChain in a hands on way.

I want it to feel like a crash course, with a Jupyter notebook that walks through the main ideas step by step, and another notebook or section that shows an LLM gateway style setup. Keep it beginner friendly, with short explanations and runnable examples that I can copy and play with.

Please make it easy to install and run from the repo, with clear setup notes for API keys and any needed environment variables. If you need to check the latest LangChain docs or current best practices, look them up online first so the examples are up to date.

The goal is for someone with only light coding experience to open the notebook, follow along, and understand how to use LangChain with a model, chain a few steps together, and try a basic gateway workflow.