So I just started BJJ a couple of weeks ago and I have a few basic questions. Pretty much I got thrown into live rolling. The problem is that I really don't understand what I am supposed to achieve in certain positions. For example: When somebody has me in sidemount, generally what type of hooks am I trying to get? I feel that everytime I get sidemounted, I have absolutely no defense. Conversely, when I have somebody in sidemount is it better to have double underhooks or head and arm control when I try to go for knee on belly? When you are in somebody's guard why is it ill advised to have your hands on the mat? Also, why do a lot of people grab both lapels, close the gi, and hold it with one hand? Lastly, when you are doing an armlock from guard why is it important to not cross your feet once you have secured the head? Thanks in advance guys. I know these are questions that should be asked in class, but at this point I'm a little timid about asking too many questions.