Obviously I cannot even begin to go into all the stuff we learned. But I have a couple of recommendations. Attend a parachute clinic if you possibly can. We all hope we never have to use our chutes, but if you do, you'd better have done everything possible to ensure it works. We also learned that we don't really know how extensively systems other than High Energy have been tested.
Quantums speaks volumes.
There was also stuff to learn for those of us with rockets. I think mine is good for at least two more years. I was happy to find out how to test it without firing it. We practiced launching unhooked too. I was surprised how many pilots were able to climb into the control bar with all their gear on.