Some people put everything on the Desktop. That’s an easy way to file things but it’s not so easy when it’s time to find them– unless you know that clicking on some bare piece of the Desktop, and then typing the first letter of of the thing you’re looking for, will jump you to the first item on the Desktop whose name begins with that letter.
If the selected item isn’t what you’re looking for, tap the Tab key to jump to the next item, alphabetically. Shift-Tab goes in reverse, if you need it.
This actually works in any Finder window, not just the Desktop.