Google Docs is the word processing app for the G-Suite platform. Check out the Google Apps Learning Center's Docs Page for help.
Kasey Bell is the author of the fantastic blog, Shake Up Learning. She has created a great CHEAT SHEET for Google Docs.
Ben Cogswell also has a great CHEAT SHEET for Google Docs.
This video teaches you about Revision History and Make a Copy.
This video teaches how to make comments and suggestions in a document as well as what happens when they are resolved/accepted/rejected.
This video teaches you how to manipulate font size, color, highlight, etc. as well as adding a hyperlink to a document and edit a hyperlink.