there are tons of good exercises, Arnold Presses, Push Presses, Behinnd Neck, Front Presses, and one of my favorites is a hammer strength machinewhere the handles are angled the opposite way of most delt machines, and u kinda lay back on it, great for the side delts. Also try scott presses. all great exercises, i find the secrest to delts is learning how to overload the side delt with compund exercises. for example ill do puss push presses, then do the whole egative via side delts by elbow position