22 ESSENTIAL LAYERS PANEL SHORTCUTS
1 Hold Cmd/Ctrl and click on the thumbnail of any layer or mask to load a selection of the shape of the layer.
2 Hold Alt and drag any layer up or down the layer stack to make a quick copy of this layer.
3 Hold Alt and drag a Layer Mask or Layer Style to other layers to quickly copy it over.
4 Hold Cmd/Ctrl and click the New Layer icon at the bottom of the Layers Panel to make a new layer underneath the currently highlighted layer.