This is very simple! For example, the first case you mentioned: this involves frame-by-frame animation. After drawing the characters, insert key frames in the following frames (according to your own needs). Then you will find that all the frames you insert are the same, and then you can click the next frame according to your own needs and delete the unnecessary parts! Quite simple! Actually, it doesn't have to be frame by frame. It's easier to do better with tween animation! Watch your pull!