We usually think that the true test of whether we know something or not, is to answer questions on the topic.
Do we know enough, deep enough, when we are quizzed on the subject?
The way that works though is our mind can play tricks on us quite easily. It can “create” stuff on the fly, that sounds smart, is convincing and more than anyone else, tells us that we know it.
The true way to know if you know something, is to teach it.
Help someone else creates notes on it.
Train someone else on it. And in a manner so powerful that they can train someone else as well.
A teacher is always greater than a speaker!