I've always liked the low-level explanation at https://git-scm.com/book/en/v2/Git-Internals-Git-Objects https://git-scm.com/book/en/v2/Git-Internals-Git-Objects

I've always liked the low-level explanation at https://git-scm.com/book/en/v2/Git-Internals-Git-Objects https://git-scm.com/book/en/v2/Git-Internals-Git-Objects It's a great exercise for the reader to recreate the core functionality of making git commits with just a few command line utilities (echo, wc, xxd, shasum).