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To understand something well, explain it.
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You must not fool yourself—and you are the easiest person to fool.
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Write down the concept that you want to learn.
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Explain the concept using simple language.
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Identify problem areas, then go back to the sources to review.
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Challenge yourself to simplify all technical terms (like explaining it to a kid).
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If you can’t explain it simply, then you don’t understand it well enough.