Google provides a wonderful Help Center that break down each product you'll find within Google Workspace.
From Drive, Docs/Sheets/Slides, to video conferencing with Google Hangouts, they have you covered!
To get started, visit the link below:
Access the Google Workspace Learning Center
Calendar
Chrome Browser
Cloud Search
Contacts
Docs
Drive
Forms
Gmail
Google+
Groups
Hangouts Chat
Hangouts Meet
Keep and Tasks
Mobile
Sheets
Sites
Slides
Voice
Home