Saving files to the desktop
It is my opinion that Windows, macOS, and other desktop operating systems should not allow users to save items to the desktop. Saving to the desktop is the equivalent of carelessly throwing papers on a desk. It also inhibits learning. Why use bookmarks, folders, or search when everything can just be thrown on the desktop?
Whatever convenience or advantages the ability offers, it's not worth the confusion and frustration it inevitably creates. As just one example, I know someone who has a half-broken monitor and who could replace it, except that a new monitor with a different resolution would cause the desktop icons to move, a price he's not willing to pay.
The flip side of this complaint is a tech tip: If you want to get better with digital file organization, make a commitment to stop saving files to the desktop.