You only see the gaps when someone else points at them.
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The fastest way to discover the gaps in your own understanding is to teach the thing. The student asks the question you assumed had an obvious answer, and the obvious answer turns out to be a folk belief you have been carrying for years.
This is why mentoring pays back asymmetrically. The mentor gets a better-understood discipline. The mentee gets, eventually, a mentor of their own to surprise.
Teach something every quarter. You will learn faster as a side effect than from any course you take.
