Android Studio remembers what you were doing just before you shut it down. So it is possible that when you start it up next, it will initially look a little different from how I show and describe it here. Start reading this guided tour, and it shouldn't take more than a couple of clicks to follow along and inspect all the different areas.
I rarely suggest that it is worth memorizing information, as repeated use and practice of concepts is a much better method to make important ideas take hold. However, on this occasion, it is worth remembering the names of the key Android Studio windows; this is so that you can easily follow along with where the action is when we are doing future tutorials. Of course, we have seen a few of these already (such as the editor and the Properties window), and if you can't remember them all, you can easily refer to this section later.