100% agree with this. Been doing it since high school though I eventually switched to digital versions.

𝘍𝘰𝘳 𝘤𝘦𝘯𝘵𝘶𝘳𝘪𝘦𝘴, 𝘢𝘶𝘵𝘩𝘰𝘳𝘴 𝘢𝘯𝘥 𝘵𝘩𝘪𝘯𝘬𝘦𝘳𝘴 𝘩𝘢𝘷𝘦 𝘬𝘦𝘱𝘵 𝘤𝘰𝘮𝘮𝘰𝘯𝘱𝘭𝘢𝘤𝘦 𝘣𝘰𝘰𝘬𝘴: 𝘧𝘰𝘤𝘶𝘴𝘦𝘥 𝘫𝘰𝘶𝘳𝘯𝘢𝘭𝘴 𝘵𝘩𝘢𝘵 𝘴𝘦𝘳𝘷𝘦 𝘵𝘰 𝘤𝘰𝘭𝘭𝘦𝘤𝘵 𝘵𝘩𝘰𝘶𝘨𝘩𝘵𝘴, 𝘲𝘶𝘰𝘵𝘦𝘴, 𝘮𝘰𝘮𝘦𝘯𝘵𝘴 𝘰𝘧 𝘪𝘯𝘵𝘳𝘰𝘴𝘱𝘦𝘤𝘵𝘪𝘰𝘯, 𝘵𝘳𝘢𝘯𝘴𝘤𝘳𝘪𝘣𝘦𝘥 𝘱𝘢𝘴𝘴𝘢𝘨𝘦𝘴 𝘧𝘳𝘰𝘮 𝘳𝘦𝘢𝘥𝘪𝘯𝘨 — 𝘢𝘯𝘺𝘵𝘩𝘪𝘯𝘨 𝘰𝘧 𝘱𝘶𝘳𝘱𝘰𝘴𝘦 𝘸𝘰𝘳𝘵𝘩 𝘳𝘦𝘷𝘪𝘦𝘸𝘪𝘯𝘨 𝘭𝘢𝘵𝘦𝘳. 𝘞𝘩𝘺 𝘬𝘦𝘦𝘱 𝘢 𝘤𝘰𝘮𝘮𝘰𝘯𝘱𝘭𝘢𝘤𝘦 𝘣𝘰𝘰𝘬 𝘵𝘰𝘥𝘢𝘺? 𝘒𝘦𝘦𝘱𝘪𝘯𝘨 𝘢 𝘫𝘰𝘶𝘳𝘯𝘢𝘭 𝘩𝘦𝘭𝘱𝘴, 𝘣𝘶𝘵 𝘬𝘦𝘦𝘱𝘪𝘯𝘨 𝘢 𝘧𝘰𝘤𝘶𝘴𝘦𝘥 𝘫𝘰𝘶𝘳𝘯𝘢𝘭 𝘪𝘴 𝘣𝘦𝘵𝘵𝘦𝘳, 𝘦𝘷𝘦𝘯 𝘪𝘧 𝘵𝘩𝘢𝘵 𝘧𝘰𝘤𝘶𝘴 𝘪𝘴 𝘰𝘯 𝘴𝘦𝘭𝘧-𝘧𝘶𝘭𝘧𝘪𝘭𝘭𝘮𝘦𝘯𝘵.

https://bulletjournal.com/blogs/bulletjournalist/the-commonplace-book-as-a-thinker-s-journal