Overhead press/ OHP:
1.) Use a false grip to protect wrists so keep weight back on middle of palms
2.) squeeze glutes to prevent excessive lower back arching
3.) squeeze shoulder blades back and don't hyperextend at the end
4.) finish overhead towards back of head to turn on rear delts and for long term mobility gains
5.) extra chins, face scar and a STRONG derp face are absolutely necessary And always foam roll and dynamically stretch your upper AND lower body before lifting. I'd do rotator cuff warmups before any push movements especially.