Various shortcuts for working with layers
There is lots of things you can do with various shortcut key combinations when working with layers to make your life easer and work smarter!
Hold down Command when dragging a layer set folder to the bin to delete, it leaves the contents of the folder intact and just deletes layer! This is a great way to re-organise your layers and much quicker than dragging them all out the layer set and then deleting the original layer set.
You can create a selection of the transparent areas of a layer by holding down Command and clicking on a layer.
You can duplicate a layer, plus any layer masks by hitting Command+J.