These groups are used to provide users the possibility to administer, edit and view links on the SharePoint Home – Features Links section. The links you see here are stored in a hidden list in your root Site Collection. https://[domain].sharepoint.com/Lists/SharePointHomeOrgLinks
Since these groups are created automatically, it is not advised to delete them. But if you want more users in your organisation, except for the Company Administrator, to be able to add links, you can just add them to the Editors group.