https://developers.google.com/apps-script
a modern JavaScript dialect
Guide
https://developers.google.com/codelabs/apps-script-fundamentals-1#0
API Reference
https://developers.google.com/apps-script/reference/spreadsheet
Google Sheets API
A1 notation https://developers.google.com/sheets/api/guides/concepts#a1_notation
https://github.com/googleworkspace
Get started https://developers.google.com/workspace/guides/getstarted-overview