Three basic best exercises for shoulders
The best exercise for shoulders for developing the lateral head is firstly the seated lateral raises. This exercise is recommended because when seated, the back is against a pad when the back is against the pad you cannot swing. The only thing that's working and being moved is the lateral deltoids that lift the weight up. 
If you are using a bit of swing and a bit of motion, by performing seated, you can isolate the lateral deltoid. Drive the feet into the grounds and push the body back and by using the lateral deltoid straight up and down. Keep the back to the pad to keep a strict form allowing more muscle activation.
Exercise number two for building round wide shoulders is wide grip upright rows. This exercise is recommended instead of a close grip because when you are doing that close grip upright row, and you are lifting it up, it works; however, your traps are heavily activated and heavily involved. Using a wide grip with the hands up deactivates the traps a little bit and places more stress on the lateral deltoids, which is what we want to hit to build up the wide shoulders. Use a wide grip to keep the stress on the muscle to allow more growth. To gather new details please go to Active Man
Exercise number three is front delt dumbbell raises. There is a technique that shifts the stress from the front delt to a lateral deltoid. The tip is the way you have your palms facing. Hold the normal dumbbell facing the body. When lifting the weight up, the front deltoids being worked. However, if you want to put more stress on the lateral deltoids instead of having the palm towards to body, have the palms facing down. As soon as you look up that stress is going to be placed on the deltoid. Keep the palms facing the ground, putting more focus on the lateral head, allowing more activating.