Is there a possibility to have a simple guide to connect a google sheet to a form? I have done all the possible and imaginable tests but without result. Thank you very much
yes, did you try to use the included Google sheets actions ?
thank you for reply. Yes, I entered the sheet id, tried all three methods in the write method field, tried different combinations with the range, created a JSON file and linked it in the Service Account JSON file path field, selected modify data source in the behaviors field, and tried different things with the form fields. Thanks.

If it can help, in debug is wrote this. Thank you.
Array ( [google_sheets_write9] => Array ( [data] => Array ( ) [response] => { "error": { "code": 400, "message": "Unable to parse range: Sheet1!A2:C2", "status": "INVALID_ARGUMENT" } }
Your data is empty, you need to set a data source, and you better test with one row first, set the range to A1:Z1