However, I'll provide some information on the history of Adobe Photoshop and its evolution, as well as the current version, to give you an idea of what's available.
Note: Adobe Photoshop CS9 does not exist; Adobe transitioned from the Creative Suite (CS6) to Creative Cloud (CC) after CS6. Below is a practical guide assuming you mean either Photoshop CS6 (last CS release) or a modern Photoshop CC version; I’ll present general, lasting Photoshop concepts, workflows, and tips that apply across recent versions. adobe photoshop cs9 exclusive