My husband took a smoking class and they didn't show them how to smoke anything. They prepared a roast for the oven.
I took a cupcake class to learn how to decorate cupcakes. They showed us how to mix a batter, (I did not need a class for that), They showed us how mix coloring into frosting, (didn't really need a class for that) and they showed us how to put frosting into bags. They did not show us one trick or tips on how to decorate. (Which was why I took the class.). If you need a refresher course in how to mix batter and fill cupcake pans, this is the course for you. They also let us sample cupcakes that had been previously baked and frosted. They truly were the driest, tasteless cupcakes I have ever tasted.