GForm create GSheets easy but i need to see/update GSheets data in a webform

How to see and update data created by a GForm in a GSheets using my mobile phone?

This topic should point you in the right direction:

To get data from a google sheet:

Query Any Google Sheet with a Web App


a bit like this:

Get a Single Cell from a Google Sheet

or see

How to use a Google Drive Google Spreadsheet as Database