how do you animate
Hello @kirishark_1357913 - Welcome to the forum.
If you already have downloaded and installed Krita on your device, this video may help you get started.
There’s also the very well written manual:
I suggest that you don’t try to make a ‘wonderful animation’ at first.
Play and learn with all the facilities to see what they can do. Then practice using them so they become second nature before you try to make a serious animation.
Making a simple animation is very easy with krita. Making something that looks good depends on you 
There’s also a cool tutorial here.