Thanks for the advice. I just have one stupid question, what are shruggs?

I apologize if this isnt the right place for this post. I want to try to build alot of muscle, but dont know where & how to start. Ive lifted for track and cross country in high school but never any serious lifting. I weigh 135lbs & ideally I want to gain 10-15lbs if at all possible. I just ...