Git from the inside out (github.com)

Seems like some images are broken on that link...here is an alternate version: http://maryrosecook.com/blog/post/git-from-the-inside-out

Another great resource is the Internals chapter of Pro Git. This opened my eyes. I've always been a Mercurial fan. Learning git from the bottom up really helped me understand what all the fuss was about.

https://git-scm.com/book/en/v2/Git-Internals-Plumbing-and-Po...

This article was originally posted on Recurse Center - https://codewords.recurse.com/issues/two/git-from-the-inside...

And here is HN discussion - https://news.ycombinator.com/item?id=9272249

The chapter Understanding Git in Git Internals by Scott Chacon also has a good explanation of how Git works.

https://github.com/pluralsight/git-internals-pdf

I really like http://gitimmersion.com/