A lot of "how do I use photoshop" questions are off-topic here, as they are not really related to photography per se. (See site definition.) On Serverfault, when I vote to close a question, I see a migration choice for some other relevant sites like Stack Overflow.
It would be useful to have a Superuser migration path — photoshop questions are on topic there, and we sometimes get computer hardware/software questions that aren't really related to photography in any important way.
Discussion on graphicdesign meta suggests that a lot of questions would be on topic there (although some of the "how do I work my software" stuff may still be better on superuser).
And finally, Video is the destination for video/cinema questions.