- No accounts, no sign-ups, no email lists.
- No cookies, ads, trackers, or analytics scripts.
- Nothing on this site loads from other companies' servers.
- Your progress (which lessons you finished) is saved only in your own browser, on your own device. We never see it. Use "Start over" on the course map to clear it.
- If you pick light or dark mode, that choice is saved the same way, only on your device.
- On a certificate, the name you type stays on the page so it can print. It is never saved, never added to the web address, and never sent anywhere. Reload or leave the page and it is gone.
- Worksheets and project sheets have a blank line, so you write your name by hand.
Like every website, our host may keep basic server logs to keep the site running. We don't use them to track anyone.