Google Workspace for Education (formerly G Suite and before that Google Apps for Education or GAFE) offers a huge amount of features and services for our users to employ, so much so that it's easy to be overwhelmed when trying to figure out how to use it all. Luckily, Google's Workspace Training has some really fantastic training videos and lessons that integrate directly with the apps themselves.
Google Workspace Training's content is provided by Google - just click on the question mark circle icon on any Workspace web site.
Also, check out these resources:
https://teachercenter.withgoogle.com - actual training, with lessons and exercises, on how to use Workspace for Education specifically for educators
https://edu.google.com/teacher - Google's hub of information for teachers to help them use Workspace tools and other services in the classroom