shoulder strength

You must get your base strength and flexibility lined out before moving to complex movements you aren't ready for.
These drills will help you hone and reinforce a strong and stable handstand position.
You can't have a solid handstand if your shoulders aren't stable and strong in an overhead position.
The standing barbell overhead press gets a bad rap, but most problems are due to the lifter, not the lift.
There's a lot more to building a huge bench press than grabbing the bar and pushing.