Adobe Photoshop CS6 Extended is different from Adobe Photoshop 6. Adobe started using the "Creative Suite" wording at the introduction of Photoshop 8, making CS6 actually Adobe Photoshop 13.
You may also see library computers with Adobe Photoshop CC 20xx (current year). This is the Creative Cloud subscription-based version, and is very similar in function to Photoshop CS6.
Adobe Photoshop is an image editor. What this means is that any digital image, be it a photo you shot or an image you pulled from online, can be edited, tweeked, played with, etc. in this program. There is an enormous amount of features and things you can do with CS6, much more than could be included in one Libguide, so further references and lists of books on CS6 have been added for you to explore.
Lynda.com has a plethora of tutorials available for Photoshop CS6 to get you started.
The best way to learn this powerful editor is to work with it. Get in and play around with an image you want to edit. Following the tutorials and actually editing an image will really help all these techniques stick and make basic processes second nature.
The Scholarly Commons currently supports Photoshop on all of the machines, and the entire Creative Suite on several of our work stations. Feel free to stop by and try it out, or set up a consultation with an expert to learn all the ins and outs of this powerful image editor.