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Tutorials that actually stick.

Interactive lessons built on 9 evidence-backed teaching principles: examples first, active doing, fast feedback, and spaced practice. Free to start, no account needed.

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Why our lessons are different

Most tutorials drown you in theory before letting you do anything. Ours flip the script.

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Why first

Every lesson opens with the problem it solves. Hook the brain before details land.

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Small chunks

One idea per stage. Working memory is limited; we respect that.

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Examples first

Concrete cases before abstract rules. Pattern recognition beats memorization.

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Active doing

Every chunk ends with a quiz, problem, or build. Recall beats re-reading 2ร—.

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Spaced practice

+1 day, +3 days, +1 week, +2 weeks. A real review schedule.

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Interleaving

The boss challenge mixes prior concepts so retrieval generalizes.

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Feynman test

If you can explain it simply, you understand it. Every lesson has this stage.

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Specific feedback

Wrong answers get the actual reason โ€” not a generic "try again."

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Real use

Every lesson ends with the real-world task the skill was meant for.