What occupation needs to know cad, ps

To tell the truth, CAD (Computer Aided Design) and PS (Image Plane Processing) are just the same skills, which are needed by both industries and professional knowledge. Just like you said that you can drive, which major and position do you need? I don't know. It's necessary to be a taxi driver. So you only know CAD and PS, maybe the printing room needs it. But to do it in the advertising design department, you can't do it without more professional skills, such as color, art and design.