If on a window machine substitute Command with Ctrl.
Mac
Command Key
Option Key
Substitute
Command = Ctrl
Option = Alt
Windows
Ctrl Key
Alt Key
Mac Commands… Windows Commands
Command Z = Back Up Ctrl Z = Back Up
Command C = Copy Ctrl C = Copy
Command V = Paste Ctrl V = Paste
Command J = Copy Layer Ctrl J = Copy Layer
Command + = Zoom In Ctrl + = Zoom In
Command - = Zoom Out Ctrl - = Zoom Out
Command T = Free Transform This command opens the free transform tool for resizing, rotating, and skewing the image using a draggable outline.
Command R = Rotate your image (to use different brush shapes)
Command I = Invert (make a negative of your image or selection)
Tools…
Shift C = Crop Tool
Shift E = Erase Tool
Shift S = Stamp Tool (Clone Stamp Tool)
Shift + = Content-Aware Move The latest content-aware tool in Photoshop CC enables you to move objects around in a photograph, and it'll intelligently fill in the gaps where they used to be.