Learning require deliberate practice because we have to think to understand.
Reading is a real waste of time and resources if we can't engrave things and concepts in our mind for a long time. So here, writing is learning, also because writing is deliberate practice.
This is called "Elaborate method".
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*From: [How To Take Smart Notes - Sönke Ahrens](How%20To%20Take%20Smart%20Notes%20-%20Sönke%20Ahrens.md)*