Understanding that the shoulders (deltoids) are made up of three heads is important if you are to fully develop them. I will show you how to build shoulders fully and properly by using the best 2 exercises to hit each of the 3 deltoid heads.
The anterior deltoid is the deltoid at the front is and is used to raise the arm upwards to the front, or to push. The best 2 exercises for anterior deltoid development are overhead presses and bench presses.
The lateral deltoid is at the side of the arm and is used to raise the arm upwards and out to the side. The best 2 exercises for lateral deltoid developments are upright rows and side lateral dumbbell raises.
The posterior deltoid is at the rear of the arm and is used to raise the arm backwards and upwards. The 2 best exercises for posterior deltoid developments are bent over rear lateral raises or bent over rows.