Here are some nontips!

I don't really like that word- tips. It suggests limits and rules: here is what you can do, here is what you mustn't do, and if you do this every photo will be breathtaking. But there are no such limits nor rules-

Your subject doesn't need to have his/her eyes open.

Your camera doesn't need to be level with the floor or even close to being level with the floor.

Your subject doesn't need to be doing anything funny, important, serious, amazing, unusual... well, you get my drift.

Your subject doesn't even need to be touching the floor!

To take a picture when someone is moving or jumping and you want to capture a precise moment, what I do is set everything up, take flash off and press the button to take the picture, but not completely. You have to fully press the button on the moment you want the picture to be. Also, you may want to practice that before the moment of the picture.