This is a very helpful guide and a good reminder for those of us who try to help users. It is written clearly. The organization into sections on successful interactions and good replies helps understanding.
I have only one request. Change "Leave replies with actionable content." to "Leave replies that tell the person what to do next." "Actionable" usually means "giving reason for a lawsuit", but has moved into corporate jargon as something that can be acted on. As the fourth bullet point in that section says, avoid jargon.