I would call myself an experienced AE user, I occasionally use cameras in After Effects...but would love some training on better uses and just a deeper explanation on how they work. I'd prefer to go to a class...I find online training difficult to focus on.
To use AE's cameras well you must first understand photography or movie camera operation.
If that expertise is safely presumed, I believe the best camera training in AE is with Trish and Chris Meyer's many books. the Adobe CIB series is also superb. What I did was find one 3D exercise I liked and then I started applying everything I could find in all of the camera options and menus including zooming, depth of field, orientation, changing anchor point positioning, and, the most valuable lesson, learning to create "camera rigs" to which a camera could be parented.
I admire your desire to pay for and travel to training but I think you can do just as well or better with a good AE book.