Dragging or copying files?
By default, when you drag a file, it simply moves it. Sometimes, it would be cool if you could drag it in the same way but decide to copy it instead. Well, it is possible. You can hold down "Alt" when dragging the files and the little green + icon will appear confirming that you are indeed copying it. I tried taking a screenshot with the nice shortcut but it wouldn't work while dragging the files.