I would say that it depends on what type of BBQ you would like.

South (Southeast US):
Pork cuts primarily
Sauces are primarily vinegar and mustard based

Midwest (Kansas City):
Pork and Beef
Sauces are primarily tomato based

Texas:
Beef cuts (brisket, beef ribs)
Sauces primarily sweet tomato based

Then base your classes from those places, in general. The best BBQ course I can think of is befriending a small southern restaurant and getting all the education for free.