I discovered this myself when I attended a data science summer school, a 2-day bootcamp. I knew Python and Jupyter. I know basics of Operations Research, though I barely passed the class back in time. I took classes on optimization classes thanks to industrial engineering classes. But at the end of the boot camp, I was as illiterate on data science as I was at the beginning. I was just more confused. Then, I understood that I was missing the mathematical prerequisites for the understanding. I still felt dumb though.