Today’s tip is brought to you by the letter S:
Try right-clicking on a file or folder and then dragging it to a new location. When you drop the file (i.e. release the mouse button), a small context menu appears; by default there are three choices: Copy here, Move here, and Create Shortcut here. Sure beats the limited left-click and drag, which by default only moves a file.
Bonus: Check out TeraCopy for faster file transfers, plus error recovery and the ability to pause large file transfers.