How do I to study and concentrate?

Sorry, since I'm a pretty stupid person. I've got no idea about studying, What to do, or how to do it. The internet is a vast source of information as I skimmed through many resources, it gave me important ideas about reviewing and rephrasing it. However, I feel like I'm missing something. Isn't studying a bit more complicated? I have a short attention span and I find myself pacing back and forth as I can never concentrate on my work long enough, instead I'm always letting my imagination lead me. I always finding myself pacing back and forth. plus with all the tips i read I'm a bit on the confused standing point. To sum it up, how should a person study? Is there some kind of useful study routine? It'd be nice it you could advise me how to to concentrate or tell me how to increase my attention span and a way to stop pacing around and being unproductive? In addition could you give me some other tips or factor that would help me. (diet, exercise, organization, music...etc.) or how to memorize things easier. So it there a method to study?