Disclaimer: I’ve had no formal education on animation. I’ve learned everything I know from careful observation & trial and error

Start with a rough draft, especially if you’re animating a whole body.

Reduce your character to a bare minimum of details. The core motion is easy to edit and polish this way until it’s ready for cleanup.

Make a blank frame and trace a clean drawing over the sketch. After that, add inbetweens to smoothen the sequence.

Loose things like hair and clothes move at their own pace. Leave them for last, so it’ll be easier to work out how they react to the core motion.

And there we go!