Privacy Policy
Last updated: September 2026
This is a general-purpose policy describing what this site actually does. It isn't legal advice — if you need this to satisfy a specific law (GDPR, CCPA, or similar), have it reviewed by a lawyer before relying on it.
What This Site Collects
No account is required to use this site. Reading lessons, looking up formulas, browsing shortcuts, and taking quizzes doesn't require signing up or providing any personal information.
Progress Tracking
Marking a lesson complete or recording a quiz score is stored entirely in your browser's local storage. This data never leaves your device, isn't sent to any server, and isn't tied to an account or identity. Clearing your browser's storage, or using a different browser or device, resets it.
Contact Form
If you use the contact form, the name, email address, and message you provide are sent by email to the site owner solely to respond to your message. This information is not added to any mailing list or shared with third parties.
Cookies
A session cookie is used only to support the admin login for the site owner. Visitors browsing the public site do not have tracking cookies set.
Analytics and Advertising
This site does not currently run third-party analytics or advertising scripts. If that changes in the future, this policy will be updated to reflect it.
Third-Party Links
Pages on this site may link to external resources. This policy doesn't cover those sites — check their own privacy policies.
Questions
For any question about this policy, get in touch.