To setup SharePoint initially, you need at lease one licence of Microsoft Office 365 (Business, Business Essentials, Business Premium, Enterprise E1, E3, E5, SharePoint Plan 1 and 2) SharePoint is basically the Business version of OneDrive but your computer (Windows or Mac) uses the “ OneDrive-App” as the program that syncs files between your computer and the Microsoft Cloud.
There is no such thing as a “ SharePoint-App“. SharePoint (OneDrive) stops syncing on older Macs from 10 Sept 21
If you or your company uses Microsoft OneDrive or Microsoft SharePoint for cloud data storage in a Windows PC environment as part of Office 365, it can also be setup to work the same way and access and edit files on a Mac OS device such as an iMac, Mac Mini or Macbook as follows. We show you how to install Microsoft’s OneDrive and Sharepoint on a Mac, so you can share files with other Mac and Windows users