When something first starts moving it starts off slow and then speeds up and slows down eg. A car also when animating jumping they slow down once they reach the maximum height and speed up when falling down? I'm not a good teacher I've already tried teaching someone but I'm better at learning than teaching so just practice animation different things. Here are a few good ones, a car, a jumping person, different types of balls (because some are squishy and bounce high whereas some are sturdy and don't bounce high), a person running (remember they start slow and speed up and when they finish they slow down before stopping, same goes for the car), flappy bird🐤 I say this because I noticed when I play flappy bird he goes up quickly and then slows down and then starts falling fast