Google Sites is a structured wiki and Web page creation tool offered by Google as a part of the Google Apps for Work productivity suite.
SharePoint is a web application framework and platform developed by Microsoft.
When migrating from Google Apps to Office 365, you need to migrate your Google Sites to its equivalent, SharePoint Online.
Cloudiway provides aunique solution on the market by being able to migrate collaborative sites from Google Site to SharePoint Online.
See Product Sheet
This set of articles provides an overview of the migration solution, how it works, what is migrated, and the limitations.