Thanks to @MeanDean for this one! As he explained, I'll ask the question at a high level, and then give an example to demonstrate what it means. Educational gaps. These are topics or possibly even subjects that your educational system failed to cover during your elementary, Junior High and High School years. Due to some oddities in our math teacher lineup and me being a year ahead of my classmates in math, our geometry teacher was just the shop teacher learning as he went for one year. As such, I never learned trig that year. We never learned how to balance checkbooks, which I feel is a basic skill we should have learned. What have you got?