This address: esriurl.com/agoorgsforschools
This document provides guidance for K12 (primary and secondary) schools on the use of ArcGIS Online Organizations. It gives the basic info needed to understand what an Organization is and does and why schools and districts should use them, without burying the viewer in minutiae. It presents guidance and suggestions, not hard and fast rules. It includes links for more information on key matters. It gets updated on an as-needed basis.