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Felipe Mattosinho Felipe Jordão A.P Mattosinho About If You're Not Studying for Retention, Just Use AI @felipe_japm · Aug 17, 2026 Studying used to buy you two things: access to knowledge, and knowledge in your head. AI took the first one and does it better than you ever will. Retention is the only part still worth chasing for. Here are 6 tips to optimize for knowledge retention: Study when your brain is sharpest For most people, that's somewhere between 04:30 and 11:00 am. Learning takes real energy and effort - sometimes it even hurts - so you want to come at it with a fresh brain, not a tired one. Your retention will thank you. Go slow Slow learning is what actually sticks. Don't mistake learning for the appearance of learning: understanding something in the moment, only to forget it by the next day, is wasted time. Take it slow enough to reflect, annotate, and revisit - even the most basic topics have something left to teach you. Every shortcut you take is time you'll spend relearning the same thing later. Map the landscape while hooking each topic onto something familiar I picture this as forcing my neurons to wire the new thing onto some pre-established knowledge. This is basically a process of making questions out loud and querying info in my brain. When I hit a term or a topic I don't know, I cover a good deal of the landscape first, before going deep into any sub-branch - the exception being a branch that helps me connect the new material to something I already know. That one is low-hanging fruit: the connection forms sooner, and the whole subject gets clearer for it. I do all of this by hand on purpose - pen and paper first, Obsidian afterwards, more on that below. Pen and paper might sound boring, but nothing else I've tried comes close for retention, and retention is the only thing worth optimizing for. Begin with a single reference resource, not with AI This might sound counter-intuitive, since so many people now use AI to build their study roadmaps. But I'm yet to see a great one. Even human-curated sites like roadmap.sh throw far too much at you, and you don't need all of that. The whole point here is that less is more. Keep it simple. Pick one good book or course as your backbone, and reach for AI only to unpack underlying concepts, connect it to something you already learned, or re-frame it in a context that's familiar to you. Don't overuse AI: your brain needs time to battle the content on its own. When your reference doesn't cover something, sit with the question in silence before you go asking. Rushing to AI only buries you in information you were never going to retain anyway. This is the 2026 version of flipping to the answers at the back of your math textbook instead of struggling through the problem on your own first. Use pen and paper This one is key. There's plenty of research showing that writing by hand helps knowledge stick - if you haven't tried it, you should. Also, screens will wear you out. I keep notebooks full of annotations, with links running between them. After each study session I take pictures of those pages, turn them into Markdown files and flashcards, and link them together inside my Obsidian vault. My second brain ends up being a mirror of my physical notes. I stumbled upon on this the other day and it's so genius -> https://www.byhand.ai/! Keep it to a few hours a day You're not in college anymore - studying all day isn't your job. Consistency is. Start with one hour a day and work toward two; that's plenty, as long as they're your prime hours. Consistency beats intensity every time. You go to the gym daily to stay fit. You study daily to stay sharp. If you're feeling tired, go for half an hour or 20 minutes, but try to make learning a daily habit.