What it means for a computer to learn, with no code and no formulas: train real models on real penguins, test them honestly, and see where they go wrong.
Free to start · adaptive placement finds your level · reviews timed to your own forgetting.
Every idea is taught with motivation and a worked example before the drills, and an FSRS spaced-repetition engine schedules each review for the day its model predicts you would forget it. A short placement check finds what you already know, so you start Machine Learning: The Whole Game exactly where it's useful.