There's no such thing as any single individual exercise you need to do for your delts. These are simply 4 exercises out of many possible different shoulder training options. You can test them out and see if they're good for you. Here are my faves:
1. Standing one arm dumbbell overhead press. The form is pretty straightforward. Just be sure to tuck your elbows forward slightly to minimize the stress on your shoulder joints.
2. Lateral dumbbell raises.
3. Cable face pull. You can play around with this to find the exact distance and pulling angle that activates your delts most strongly.
4. Forward dumbbell raises.
Remember, your delts are the single largest muscle in the entire upper body, larger than the pecs, the traps, and even the lats. So they deserve a little pampering!
Shoulder exercises are honestly a pretty simply matter. I'm excited to share my progress with you as time goes by. It's a long-term project. Thanks everyone!