If you want to retain what you learn, you should write it by hand

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Studies showed that when children and teenagers write by hand, their brains are much more active than when they type on a keyboard or touch screen, generating more activity in the sensorimotor areas of the brain. The very contact between pen and paper stimulates numerous senses to connect different brain regions and help the brain connect memories. The fine motor skills involved in writing with also help put the brain in a learning state, because those who write by hand must engage with the content more intensely, making it easier for the brain to remember the content.