Commands… Option Command Z = Back up multiple steps
Command C = Copy
Command V = Paste
Command J = New Layer
Command + = Zoom In
Command - = 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)
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 inPhotoshop CCenables you to move objects around in a photograph, and it'll intelligently fill in the gaps where they used to be.