I've looked in FAQs & tried Search & don't know where else to try.

In stats the last is "Referrals?" What does that mean?

Each post we read gives us options to Reply or Thank. I've noticed that some people Thank a lot--almost like saying "Yes, I read this." Others hardly ever. What is this "Thank" option intended for?

When posting we're invited to include tags. Is there a Short Course somewhere for how to do this wisely?