Take a look at this page.
http://www.apple.com/findouthow/mac/
It contains short, simple video lessons on common Mac features. It makes learning Mac basics and the popular software programs (iPhoto, iMovie, etc.) really easy to learn.
I learned the basics and got started with video editing with iMovie in less than 3 minutes.
I bought the iMac for its photo handling system which appears superior to everything else I’ve used.
I use a Canon 60 D and have four pretty good lenses to play with. I’m retired and just like to fart around...