Contact

What is worth writing about

• A question about the material. If a lesson lost you, say which one and
  where it stopped making sense. That is the most useful message this site can get:
  a confusing explanation is a bug, and knowing where people trip is how it gets fixed.
• An error. A wrong fact, a broken tool, a number that does not add up.
  Every count on this site is counted rather than estimated, so if one is wrong it is a
  bug worth reporting.
• Something missing. A topic you expected and could not find, or a tool
  you keep wishing existed.
• Accessibility. If anything is unusable with a keyboard, a screen
  reader, or at your text size, that outranks almost everything else on the list.
• Reuse. Teaching from this material is welcome: ask and the
  answer is usually yes.

What to expect

This is a small independent project, not a support desk. There is no
ticket number and no promised reply time. Mail does get read, and specific questions get
better answers than broad ones: the page you were on and what you expected instead
is usually enough to work with.

What happens to your message

It goes to an ordinary mailbox and nowhere else. There is no form on this page, no
contact database, no ticketing system, and nothing about your visit is recorded:
the button above simply opens your own mail app. The
Privacy page covers the rest of what the site does and
does not collect.