Erase Mac desktop data without affecting other devices
Hi,
I have an old MAC desktop and a MacBook Air on macOs 15.5. I am going to sell the MAC desktop so I therefore need to delete everything on it before returning to factory settings. The MAX desktop is synced to my MacBook Air as well as an iPad and iPhone.
How do I delete the whole contents of the MAC desktop without deleting anything from my other devices?
Thank you for your assistance.
Roslyn