SharePoint Default Permission Groups 101
After creating a new SharePoint Online site (aka Site Collection) several permissions groups are automatically created for you to help you manage permissions for the given SharePoint site.
By default, the following default permissions groups are created for you:
|SharePoint Group||Default Permissions Level|
|<site name> Members||Edit|
|<site name> Owners||Full Control|
|<site name> Visitors||Read|