Apart from everything that's already been said, there's an older art form called "painting" that can help a lot to learn about photography.
It's completely different, yet humans have been painting since… well, it's been a couple thousand years, and for the last 5 ~ 6 centuries some really bright people have spent their lifetimes experimenting with light, color, anatomy, movement, composition etc.
There's a reason why we have a "Rembrandt" light, there's a reason why we talk about chiaroscuro. The not-to-be-discussed-again Rule of Thirds and that other nasty discussion subject, the Golden Rule -- discussed here elsewhere with some great insights -- … those also come from painting and most of the basics come from the Renaissance.
Not everyone makes a quick jump from paintings to photography, but it's my personal opinion that if you take the time to go to a museum and look at paintings from a photographic point of view, you'll find out new things about photography and you'll probably find you some very interesting things about Art in general.