You don't study photography, you just do it.
The advantage of taking pictures of the famous is that they get published.
Color is descriptive. Black and white is interpretive.
The thing is that when you don't carry a camera, that's when you see pictures in particular, or at least that's when you think you see pictures in particular. When you do carry it, if you do see one on the occasion that you do, you can take it.
All the technique in the world doesn't compensate for the inability to notice.
The best things happen when you just happen to be somewhere with a camera.