I want to read and write Google spreadsheet from Dialogflow

I'm a beginner who doesn't even know if it's appropriate to ask this question.
I would like to use Google Home+Dialogflow to read and write Google spread sheets on each user's Google Drive.
I don't know what to do, including user authentication.
What is the best way to do this, and what is the best way to do it?
I would appreciate it if you could tell me where I can ask these questions and the helpful URL.
This is an ambiguous question that I can't explain well, but I appreciate your cooperation.