Letting go of the button is the drop part of drag and drop. For example, an icon of a file can be dragged and dropped onto the waste can icon for deletion or onto a printer icon for printing.

Use the same drag and drop technique to reorder your favorite locations ... You should also consider enabling the path bar (and path icon) in Finder and creating some useful smart folders ...

Drag and Drop - Right Button - Copy or Move Dragging the icons with the right mouse button is the more cautious method because you are prompted to either Copy or Move when you drop the files/folders.