Tutorial: Photoshop's Undo, Steps, and increasing history states.
Photoshop is a great program, but it functions a bit differently ;than other programs. For example undo (ctrl z) only does the last step. This video demonstrates how undo and redo work in photoshop as well as how to see your history of what you have done. You can also change the number of history states that photoshop saves from 20 to 1000. Great video for someone new to Photoshop.
http://www.sterlingteaches.com/adobe/
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