The capabilities with photoshop are endless. Photoshop is one of my first Adobe programs I started with nearly a decade ago. It was the light that directed me to a career in digital media and graphic design. I'm on it almost every day doing something new for fun.
I also often use photoshop as a final step after making illustrations in Adobe Illustrator and transfering them over to Photoshop to add a bit of pizzazz to my illustrations.