10 TOP SHORTCUTSImage Size CTRL-ALT-I
Canvas Size CTRL-ALT-C
Change Brush Size [ or ]
Duplicate Current Layer CTRL-J If something is selected, new layer will contain selected areas
Merge Layers CTRL-E Merge two or more layers (if several layers are selected)
Copy Merged CTRL-SHIFT-C Copy contents of all visible layers into clipboard – very useful!
Move Layer Down/Up CTRL – [ or ]
Move Layer to Bottom or Top CTRL-SHIFT - [ or ]
Quick Opacity Change 1,2,3,4,5,6,7,8,9,0 Set current tool or layer opacity to 10%,20%,30%...
Last Filter CTRL-F Repeat last filter used
7 COLOR CORRECTION SHORTCUTSHue-Saturation CTRL-U
Levels CTRL-L
Curves CTRL-M
Color Balance CTRL-B
Quick Channels CTRL-1, CTRL-2,
CTRL-3, CTRL ~ Use instead of switching to Channels palette for quick channel selection
Desaturate CTRL-SHIFT-U
Invert CTRL-I
8 IMAGE EDITING SHORTCUTSUndo CTRL-ALT-Z History step backward
Redo CTRL-SHIFT-Z History step forward
Transform CTRL-T Try ALT and SHIFT when transforming
Fade CTRL-SHIFT-F Hope you know what Fade is used for
Select All CTRL-A
Deselect CTRL-D
Invert Selection CTRL-SHIFT-I
Brush Settings F5 Set advanced brush settings
3 INTERFACE SHORTCUTSToggle Screen Mode F
Hide/Show Palettes F6, F7, F8, F9 Color, Layers, Info, Actions Palettes
Hide/Show Tools and Palettes TAB
Source Digital Photography Club