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Spotlight Search (Command + Space) is the easiest way to get around on your Mac – you can use it to do things, as well as find them.
Is this thing on?
Spotlight Search works through multiple categories to get the results you need. You can find out which categories it is actively using on your Mac in System Preferences>Spotlight in the Search Results pane. Here you can check all the different kinds of categories it will explore for you, things like Documents, Music, Movies and more. (For best results, make sure they are all enabled).
You may find that the result you want to use isn’t the first one on the list when you are presented with results, in which case you can click on the one you want to use or use the up/down arrows to move between items. (Or use the Command and the up/down arrows to switch swiftly between categories).