I think that the first shock-wave that hit me as a parent was that there was nothing, from all my schooling, that I could pass down to my children. It was horrifying to discover then!
At the same time, what was also quite a shock to me, was the fact that I had so little (if any) information despite all my schooling, about raising kids. To my 21 year old self, that was a real shocker. And the beginning of a journey of my own research, still continuing to this day.