There is a massive one hour fanning workshop with Jerry in XB1. It covers all the basics, thumb fan, pressure fan, giant fan, and the 180 degree twin fans. The only real fan in CtG that i'm aware of is the Flipback fan.
CTG is mainly for very advanced flourishers. Many stuff like the ctg, flipbakc fan, birdy fan, heaven display, are gonna be very hard. So if you're up for that challenge then get CTG. If not, like penguincdude said, xb1 has a really great fanning workshop.