I would say it was fairly basic wine tasting - how to hold the glass, swirl the glass, smell the wine, taste wine, etc.
You get to sample 7 wines and the same wines that are available during the cruise. I do believe most of the wines are on the higher end of what is offered on board. Even though I'm not much of a fan of wine and my wife didn't need the basics, we both enjoyed it. We found it a nice relaxing break from the usual running around we had been doing.