If you grow a plant from seed and let it grow naturally, you're going to usually get a main bud with some offshoots, ranging from a couple small branches to bushes, to Christmas tree shapes and branch structure.
If you intervene, you can change the structure of your plant to suit your set up.
I would advise getting your hands on a copy of the grow Bible or going to YouTube and looking for videos explaining the different methods, as it is much easier to see the different varieties than to read about them (if I wasn't on mobile, I would be of more help)