OOOOOOooooh this is honestly my favorite habit and it helps so much! For anyone that also likes notebooks that have fancy notes (color coding, specific topics, revised notes for later review) it helps to have one separate notebook for those notes, and an easy-to-carry notebook for scribbles and idea jotting.
Sometimes when working through problems on paper, you might encounter some [method, topic, practice] that might help in the future and it'll definitely be a lot easier to have a proper section in a cleaner notebook instead of having it scattered amongst a sea of scribbles.
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