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Keeping your computer tidy is mostly a matter of putting things where they belong. That means moving and copying files and folders to different locations. You have to be authorized to open folders to which you’re copying items, which means you can’t put files in other users’ folders, for the most part.
To move an item to another folder on the same disk, drag and drop it into the folder’s window.
To copy an item to a location on a different disk, drag and drop it into the folder’s window.
To copy an item to a different location on the same disk, press Option while you drag and drop it into the folder’s window.
Tip: Another Way to Copy
To make a copy of an item in the same place, press Option and drag the icon a little away from its current location or choose File, Duplicate.