🔁 Practice — spaced repetition
This is the part most courses skip, and it's the most effective thing on this site. Two findings dominate learning research: testing yourself beats re-reading (retrieval practice) and short sessions spread over days beat one long session (spacing). This page does both for you: 49 cards across all three chapters, interleaved, scheduled with a Leitner system that hides what you know and repeats what you miss. All progress stays in your browser.
How to use it Come here for 5 minutes a day after (or during) the chapters. Read the card, answer out loud or on paper first, then flip. Be honest with the buttons — "Again" is not failure, it's scheduling. Cards you know keep moving to longer intervals: 1 → 3 → 7 → 21 days.
Why interleaved? Cards from LaTeX, Manim and manim-slides are shuffled together on purpose. Mixing related-but-different material feels harder — and measurably improves your ability to pick the right tool later. The difficulty is the point.