Learning by Writing2020-01-01
I believe that the ultimate test that you understand a concept is when you can break it down to its simplest form and teach it to someone.
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 yourself. It shows you what you don't know, it forces you 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.
That is one of the reasons why I like writing, it's not just about communicating ideas, but also about learning.