Do you want the instructor to spell it out for you? Maybe take some pictures for you? It's not hard to understand. Take yourself out of your comfort zone and take pictures. If you're taking a picture and you're thinking 'this is easy, I'm comfortable' don't take it. If you're taking a picture and you're thinking 'why am I taking this picture' - sit back and think about it, or don't, and ask questions of yourself that someone else might ask you and then have the answer ready.