I've learned some about photography, but most of it the hard way.
Over a year ago I bought a Rebel X and it came with a 35-80 standard lens. I also bought a Tamron 100 - 300 lens.
I mistakenly thought that an SLR, even an older one like that would be much better than a point and shoot camera. I bought this all mainly for concert photography. (My wife wanted pictures from a Rick Springfield concert we would be going to.) I'm no pro, just an amateur. Boy was I disapointed. Many of my initial shots with the big lens didn't come out at all. The ones that did come out were either grainy, dark, and/or a blur.
Most lenses, especially the cheap ones, can't open enough to let in enough light, so the camera lowers the shutter speed to get a decent exposure. Well, then you have problems.
Maybe a year ago I found photo.net and I read about concert photography. That led me to buy the 50 f/1.8. It's a great lens. Mine is the cheap version with the plastic mount, but it takes great pictures. I get sharp, clear pictures, even in low light. The exposure is much, much better. Now I am happy with my pictures.
I can stil use my big lens, but only outside and also if it's sunny. I have some nice pictures from the zoo I just took with that Tamron. I normally don't even bother to carry the 35-80 with me.
Now I just need to learn how to get good pictures with a flash. All my previous flash pictures have some problems. I get harsh shadows, red eye, washed out skin tones, etc.
I did just recently buy a flash bracket and I read up more on how to use the flash that I have. I think I've been getting too close for the most part, but my technique leaves a lot to be desired in general. I could also have some settings wrong on the flash and/or the camera, but that can be lumped into the technique category.