absolutely true. Your legs are your foundation and have the most muscles, along with your back. Therefore the most anabolic lifts you can do are the squat and deadlift. Do them along with the ol' bench press, military press, a pulling movement (rows, chins) and you're good to go.
Learn to love to squat, it is hands down the king of all lifts. Also, when you do squat make sure you go all the way down! A squat is not a squat until you break parallel. If you only squat halfway you won't contract your hamstrings and end up having to deload later on. So along with having a good diet, training program, and getting plenty of rest, lift with good form!