Animation not doing what I want it to.

Recently, I’ve had the need to learn animation. I understand the basics of animation, but something goes wrong when I DO try to animate something.

I’m trying to animate a characters hands to look like they’re moving up and down to make it look like he’s breathing. I set the keyframes every ten frames, and when I try to play the animation, instead of doing what I wanted it to do, it juts jiggles around and moves in a way I didn’t tell it to. Am I doing something wrong?

Also, while I’m here, how do I copy and delete keyframes?

you need to send a blend file or explain more. not enough info