When you teach something, you get to learn it twice: once on your own, and then again through educating another person.

make sure you’re putting the notes in your own words. By processing the information enough to paraphrase, you’re gaining a deeper understanding of the material than if you simply rewrite what is in the text.

Feynman Technique, which is named for the famous physicist, Richard Feynman. There are four steps to this: choose a topic or skill, summarize or demonstrate it as succinctly as possible, seek out your blind spots through how easy or difficult the previous step was, and then use an analogy.