Here are some quick shortcuts for changing your interface in Photoshop
Hit Tab on its own and see all your palettes and bars disappear. Hold Shift while pressing Tab to hide just the palettes on the right.
This two-finger shortcut cycles through open tabs in the Photoshop interface. Hold Shift in this shortcut to cycle the other way.
Press F once to enlarge Photoshop to cover your entire screen. Press F twice to show just your image and nothing else on your computer. Press F once more to return to normal Photoshop.
This combination of keys closes down all open tabs in one, prompting to save files along the way.
This one’s for Photoshop CS6. Press F1 holding the Function key to darken the interface in CS6. Hold Shift and press F2 to lighten the interface using one of the four grey to black options in the new version.