My mentor always taught me, photoshop is like a piano: an instrument with a limited number of keys with which you can create an unlimited amount of music.
One of my favourite things about working with artists and curators is explaining the process of image making, processing and image file preparation; it is so often a small tweak that makes the difference between an image that will suffice technically or not.
As well, it's also nice to understand compression, gamut, image sizing and whole other bundle of basic things that make life easier (and pictures better!).
If you have questions about any of these processes, drop me a line, and we'll pick a time. Come armed with your photoshop questions, and we'll spend an hour hashing them out.