I learn best with a goal in mind. So, my entry into learning Adobe Illustrator was by tracing the outline of this Japanese castle. It required one tool in the entire application and by the end of the project I was pretty good with it! I continued learning one major tool at a time. Youtube videos and blog posts were helpful.

original: https://upload.wikimedia.org/wikipedia/commons/3/38/Matsumot...

mine: https://github.com/YosaiProject/yosai/blob/master/doc/docs/i...