Git Makes More Sense When You Understand X

As I mentioned in Why This Site?, I once tried to help a friend learn Git by saying something that—he later told me—wasn't all that helpful. After getting that feedback, I started noticing this pattern:

People tend to say things like "Git makes more sense when you understand [...]".

So I did a quick Google search for that phrase in April 2011, and it turned up over 8 million results. (Here, try it yourself.)

I've chosen a few examples of this pattern to talk about briefly.