If you're serious about animation, you will encounter these principles over and over. I didn't make them up. The rules for great animation were introduced by two famous Disney animators Ollie Johnston and Frank Thomas, in their book "The Illusion of Life: Disney Animation". This was the first book published that established clear rules on animation, and it's kind of a "Bible" for all modern animators.
Please reference these principles each time you attempt animation. I will assess your progress with these guiding what I am looking for. Each assignment will allow you to practice one or more of them.