Karpathy method + Claude Code reading your whole Obsidian vault is the smartest second brain on earth.
The method is simple and brutal. If you can’t build a thing from scratch, you don’t know it. Tutorials are fake learning and your brain deletes them in 3 days.
Most people ignore this. They build a second brain that just sits there, folders of notes nobody reopens, dead text.
Point Claude Code at the vault and it wakes up. 5,000 notes, one mind. It reads all of it and answers in your own words and your own proofs, not a model’s guess.
Then the loop closes.
Want to understand neural nets? Skip the 3-hour video and ask Claude Code to build a tiny one. 200 lines from scratch. Watch it train, break a layer, watch it fail, fix it.
It clicks in 20 minutes instead of 3 weeks.
The second it lands the note gets written. One idea per file, linked to 10 others, dropped into the vault while the memory is still hot.
Now it compounds.
Month 1: is 60 notes. Month 6 is 900. Every new note pulls in old ones, so you ask anything and the answer comes from your brain, not the internet.
Before: 40 tabs, 6 half read PDF, 0 retained.
After: build it once, own it for life.
Setup takes 4 minutes. Plain text, no lock-in.
A second brain nobody reads is a graveyard.
Yours just started thinking.
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