Create and edit spreadsheets documents. Multiple people can work at the same time, you can see people's changes as they make them, and every change is saved automatically.

https://gsuite.google.com/learning-center/products/sheets/cheat-sheet/#!/
https://gsuite.google.com/learning-center/products/sheets/get-started/#!/
https://support.google.com/docs/topic/9054603?hl=en&ref_topic=1382883
Final - Google Sheets Slide Deck

Sheets Tips, Tricks, and Trainings