There is a continuation on photography basics over on the Digital Photography School blog. If you don't understand "exposure" or "stops" or just want a better understanding of what elements go into what is referred to as an "exposure" (a picture), jump over there and check it out. That blog has endless tips and how-to articles. I've learned many a thing from it.
The triangle to the left (courtesy of DPS) is the essential "what makes a photograph look like it does" diagram. Each of the 3 components has a direct effect on the other. The whole thing is quite mathematical actually! (I enjoy it.)