Writing as a learning medium2020-01-01
I believe that a good test that you understand a concept well is when you can break it down to its essence and teach it to someone that's unfamiliar with it.
Sometimes we think we understand something, but only when we try to explain it to someone we end up realizing that we didn't really have a good understanding of it.
Therefore explaining a concept to someone else is also a very good way to learn something ourselves. It shows you what you don't know and it forces us to self reflect and put concepts in our minds into words.
I find that writing your thoughts and ideas has a very similar effect, it's as if you're explaining something to an imaginary person.