Diabolo beginners. Can't control the direction.

Your question will be met by many beginners. Whether it is playing diabolo with two wheels or single wheel (more complicated).

You should pay attention to both two-wheel and single-wheel play. When you are a beginner, try to keep the pole moving up and down in parallel and do drumming. Don't let the thread touch the diabolo plate, which is what you call a drumhead. This is the reason why diabolo is crooked.

and the winding of the thread

Diabolo without bearing can't be wound around the shaft or it won't shake. It's better to have a cross state.

Diabolo with bearing can be wound several times on the shaft. If it is found that it can't be pulled up, just drop the diabolo.

No matter how you play, your right hand is forced and your left hand is assisted (left-handed is the opposite).