https://www.domestika.org/en/courses/1210-creating-loop-animation-stories

 Learn how to animate characters frame by frame using simple designs
You don't need very complex shapes or animations to achieve fun and exciting animation pieces. With simple designs, geometric shapes, and a few tricks, designer and animator Pablo Cuello manages to squeeze the most out of frame-by-frame animation to create his hypnotic pieces.
In this course, he teaches how to animate characters in loop and how to exaggerate their movements using animation principles, so that they perform different actions over and over again.