The fastest way to duplicate a layer in Photoshop

You can click and drag a layer to the Create A New Layer button at the base of the Layers panel to create a duplicate of that Layer. But with a keyboard combination and a slight nudge, you can do the job even more quickly. Just press and hold [command][option] ([Ctrl][Alt] in Windows) and then click on any layer thumbnail in the Layers panel and drag it slightly in any direction and release. Photoshop will create a duplicate of that layer in the Layers panel in the blink of an eye!