For me my normal approach to taking notes is to not consider them permanent. Often I throw away all the paper I write on. Obviously if it's for documentation purposes, not.
Though more often than not I write documentation digitally and my notes are to help me organize or figure out a problem in my head, so they're more like sketches, as opposed to a journal. I found that what works best for me is to have a standard A4 notebook around for big idea sketches, flows etc., and for the rest have tiny notepads with easy-to-rip pages to make notes.
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