LEARN

Most study advice is folklore. But decades of cognitive-psychology research have actually measured how memory is encoded, consolidated, and retrieved — and the results are humbling: the techniques that feel productive (re-reading, highlighting, cramming) are among the weakest, while the ones that feel slow and effortful (self-testing, spacing, mixing topics) are the strongest. This module is the map of what really works, with the landmark studies and effect sizes attached.

It's also a mirror. This app is built on retrieval practice (every flashcard and duel makes you pull the answer out) scheduled by a spaced-repetition algorithm (FSRS) that shows you each card right as you're about to forget it. So learning how to learn doubles as learning why the platform in your hands works — and how to squeeze the most out of it.

Every technique is stated with its mechanism, the evidence (and how strong it is — well-replicated vs. preliminary vs. debunked), a concrete how-to, and its limits. Where a popular "hack" doesn't survive scrutiny — learning styles, left/right-brain, "handwriting beats typing," the 25-minute Pomodoro as a magic number — it's flagged plainly.

Six missions, ordered so each builds on the last:

1. How Memory Works — the forgetting curve, storage vs. retrieval strength, the spacing effect.
2. Retrieval Practice — the testing effect, why pulling beats re-reading, why duels work.
3. Spaced Repetition & the Algorithms — intervals, SM-2's ease factor, FSRS's memory model.
4. Desirable Difficulties — interleaving, spacing in practice, elaboration, the Feynman technique.
5. Metacognition & Myths — the illusion of competence, dual coding, and the myths to unlearn.
6. Focus, Sleep & Systems — attention & Pomodoro, sleep consolidation, note systems, your routine.