The most effective exercises are those that recruit the most muscle fibres and the most nervous system involvement. The best exercises are those that require you to move your torso through space (squats, deadlifts, chins, dips, handstand pushups, pushups, etc.). Then second most effective are compound movements that require you to stabalise your torso in space (standing military press, bent row, etc). Next comes compound movements with free weights (bench press, seated military press, etc.). So for shoulders I would recommend handstand pushups, hindu pushups, and standing military press. For biceps chins, pull ups. standing barbell curls.