x : Toggle foreground and background colors
d : Toggle default black as foreground color, and white as background color.
Hold alt key : Toggle Color Picker[when paint bucket is active]
Ctrl+Alt+Z : undo more than once.
Ctrl+Shift+Z : redo more than once.
Ctrl+Z : undo(again will do redo)(again will do undo).. so on..
Ctrl+A : to select all
Ctrl+D : to deselect all
Ctrl+R : View/Hide Rulers[View> Rulers]
Ctrl+A: Select all
Ctrl+D: Deslect
Ctrl+Shift+D: Deselect Layers

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