I always upvote content from Julia Evans, she's doing amazing things on many different subjects. And this is no exception.

That said, specifically about Git internals, I found that the "ugit: DIY Git in Python" tutorial [1] by Nikita Leshenko was never surpassed in terms of quality and clarity as to understanding the inside of the .git repository.

[1] https://www.leshenko.net/p/ugit/

Also recommend reading https://tom.preston-werner.com/2009/05/19/the-git-parable.ht...

Off topic:

This is especially good to know when you’re exfiltrating .git folders that are unprotected and publicly accessible on websites :-)

Seriously though, make sure you’re deleting .git folders from deployed websites - or at least prevent them from being accessed. In at 300+ of the 1000+ website .git folders I downloaded from random websites there were private access credentials to AWS, GitHub, OpenAI, etc.

I discovered Julia Evans just the other day from a talk she gave about and she's fantastic. Glad to come across her work again.

Oh dear. My comment got somehow corrupted. It was a talk about kernel hacking.