Google Classroom has an established training area on their Google Education Site

https://teachercenter.withgoogle.com/first-day-trainings/welcome-to-classroom

CPS Learning Technology Google Slideshow on Google Classroom.

https://docs.google.com/presentation/d/1d9qx1G1KHO9bnG5xrLvSKuRuqOXMRynL0ouj0D0Hnf0/edit?usp=sharing

This is a good video on how to use Google Classroom in an exclusive remote learning situation like now. The presenter explains the changes he made since he teachers remotely due to the ConaVirus situation.