SharePoint Online Admin Center

This is what the SharePoint Admin Center would look like:

In the SharePoint Admin center you would be able to administer your SharePoint Tennant and view details.

NOTE: You would need to be a Global Admin or a SharePoint Admin to access this area. Everyone else would get an access denied

Default Site Collections

Find content about the SharePoint Online admin center: https://support.office.com/en-us/article/Find-content-about-the-SharePoint-Online-admin-center-887D34FD-7C6B-4323-9E1A-4B479F2AA277