Google continues to improve on its Google Classroom. Here is a useful guide from Common Sense Media on all things Google Classroom.
Teachers’ Essential Guide to Google Classroom | Common Sense Education
What is Google Classroom? Is Google Classroom an LMS? Who can use Google Classroom? How do teachers use Google Classroom? How do I set up my Google Classroom? What is Google doing with my students’ data? Should I be worried about privacy? How can Google Classroom support differentiation in the classroom?
and here is the Google Classroom Community Page which has all sorts of resources and a terrific feature “describe your issue”
