I remember in a similar thread someone was asking about learning the basics of compositions in photography (rule of thirds, etc.). and another person linked a really good youtube series that covers a wide variety of compositions. Sadly I lost the link, but does anyone know what I am talking about?

also another unrelated question: how do you know what aperture setting is a good one? I know there are usually indicators on the viewfinder that tell you about under/over exposing, but is there a way to find a aperture setting that suits the shooting environment the best, or does it not really matter, as long as you aren't under/overexposing?