Privacy
Short version: you don't sign up, and this site doesn't track you.
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Videos
Some lessons show YouTube videos through youtube-nocookie.com. When you play a video, Google's privacy policy applies to it.
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The site is hosted on Cloudflare Pages. To deliver the pages, Cloudflare processes basic technical data such as your IP address, under Cloudflare's privacy policy.
Questions
Last updated: September 24, 2026.