1. Change image size
Control + Alt + i (Command + Option + i )
2. Change canvas size
Control + Alt + c (Command + Option + c )
3. Zoom in
Control + + (Command + + )
4. Zoom out
Control + – (Command + – )
5. Scale Proportionately
Hold the shift key while selecting the object
6. Scale in place (from center of the object)
Hold shift + option while selecting the object
7. Show Rulers
Control + r (Command + r)
8. Show or hide the grid (the automatically-generated horizontal and vertical lines that help align objects to the canvas.)
Control + ‘ (Command + ‘ )
