How to Build a Personal LLM Knowledge Base (Karpathy’s Method)

In this video I'll show you exactly how to build an AI-maintained personal LLM knowledge base, (often called an AI second brain) on any topic with no coding required. It’s the exact same method used by Andrej Karpathy (who popularized it) and Lex Fridman. You'll walk away knowing how to collect sources, get Claude to compile them into a structured personal wiki, and query it to get answers no single article could give you. And I’ll show you in real time how to build one using a real hypertrophy wiki I made to help me build muscle as fast as possible. This isn't about pasting things into ChatGPT. This is a completely different way to use AI, where Claude reads all your sources and writes you a personal Wikipedia that grows over time, lives on your computer, and never forgets anything. What you'll learn: What Andrej Karpathy's LLM Knowledge Base actually is (explained for non-technical people) The three-phase workflow: Collect → Compile → Query How to set up Obsidian and Obsidian Web Clipper for free The exact prompt I use to compile a wiki from raw sources How to query your wiki to get answers no single article could give you Why this beats just asking ChatGPT every time Tools used in this video (all free except Claude Code): Obsidian — http://obsidian.md/ Obsidian Web Clipper — browser extension Claude — claude.ai Claude Code — for accessing local files Link to the prompt to create the wiki: https://benstevenson.notion.site/Wiki... I also created a free prompt pack with 25 of the best prompt to use with your wiki. These help you learn more, improve the wiki, find gaps in your knowledge, and hone your thinking skills about the topic. You can get it here: https://www.sciencebased.ai/resources... Timestamps: 00:00 - Why you should care 00:46 - Personal LLM Knowledge Base Overview 03:01 - Tutorial