Bodybuilding Online Guide

I want to get in shape to try and boost my confidence levels. I’ve just start cardio. Swimming 4 times a week for an hour and light running at the moment for about 15-20 minutes once a week.

What are the benefits of weight training if I take it up?

I power train (power lifting and olympic Style weightlifting)
Im 6′1 185 Bench 250, alot of muscle dense (not alot of muscle size)
and i was wondering are there any benefits of bodybuilding besides muscle size