I like the idea but the title's a bit misleading. For comparison, this article is over twice as long as the Git in 5 Minutes guide that you reference. I'm not trying to be snarky, I was just very surprised when I saw the article's length.

People searching for Git in X minutes might prefer a shorter preamble and a more expository form, like this: http://rogerdudler.github.io/git-guide/

/2¢