I'll add that with the GUI you don't know exactly what GUI menus correspond to what Git commands, and therefore you can't be sure exactly what the behavior will be when you click that button.

Frankly, after you've used git regularly for a week, you'll find that there are two or three commands that you use constantly and never have to think about, and a small set of other commands that you'll have to look up the first half dozen times you use them.

Don't worry, git documentation is quite good.