I've been using Photoshop for many years now and because of my experience I was asked to teach Photoshop on a one-off basis to a class of 20. These people are beginners and have likely never even opened Photoshop before. Therein lies my problem, I have no idea WHAT to teach. I suppose my experience in Graphic Design has taught me specific ways to use the program, i.e. doing cutouts, improving compositions etc, but I'm not sure I can fill a day's session with what I use it for.
Can anybody suggest what they would teach if they were to do a similar session to mine? What would you consider to be the basics.
[I know this question is slightly subjective, however it is very constructive for me to see the answers and it will help me a great deal]