Einstein defined it long ago

‘If you can’t explain it to a six year old, you don’t know it yourself’

More precisely you must be able to teach a concept you understood well, to a junior two years younger hence.
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via What does it mean by understanding a concept? – Quora

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Hemant Pandey
Hemant lives in Mumbai (India),writes on Quora (2600 followers, 2.8 million views).Published 5 books on Amazon Kindle. Entrepreneur, Writer, Mathematician, Professor.