Famous physicist Richard Feynman, he was notorious for asking his mathematicians to explain concepts in simple language to test their understanding…
Richard Feynman was a physicist who received a Nobel prize for his work in quantum electrodynamics.
Here is Freynman unique 3 steps technique to learn new materials:
Step 1. Choose a topic you want to understand and start studying it. Once you know what it is about, take a piece of paper and write the topic at the top of the page.
Step 2. Pretend you’re teaching the idea to someone else. Write out an explanation on the paper while you describe them out loud. Like this you get an idea of what you understand and where you still have gaps. Whenever you get stuck, go back and study. Repeat that process until you can explain it.
Step 3. Finally do it again, but now simplify your language or use an analogy to make the point. If your explanation ends up wordy and confusing, that’s an indication that you do not understand the idea well enough. If that happens go back until you have mastered it.
The Fantastic Mr Feynman