Tom Preston-Werner:

Git is a simple, but extremely powerful system. Most people try to teach Git by demonstrating a few dozen commands and then yelling “tadaaaaa.” I believe this method is flawed. Such a treatment may leave you with the ability to use Git to perform simple tasks, but the Git commands will still feel like magical incantations. Doing anything out of the ordinary will be terrifying. Until you understand the concepts upon which Git is built, you’ll feel like a stranger in a foreign land.

The following parable will take you on a journey through the creation of a Git-like system from the ground up.

A fantastic introduction to plumbing of Git’s internals in very easy-to-understand concepts and analogies.

If you’re struggling to learn Git, this resource would definitely make the learning curve less steep.