Canonical links to Google's advice: https://support.google.com/a/answer/81126 https://support.google.com/a/answer/81126 and https://support.google.com/a/answer/

Canonical links to Google's advice: https://support.google.com/a/answer/81126 https://support.google.com/a/answer/81126 and https://support.google.com/a/answer/14229414 https://support.google.com/a/answer/14229414 (and yes, this was supposed to be enforced last year)