Good MATH question!
I generally respond, when can, to some (first year) Calculus questions. Partially because that math catagory often (seemingly) lacks common sense or intuitive approach / description. But, with good teacher it's not so daunting. I was lucky, first couple of college semesters, to have a good Prof.
My interpretation has been that there is a definite heirarchy, going up the scale of complexity, and if Calculus is not taught with that orientation, that is taught by just throwing everything into (a textbook), then it's difficult to follow.
Briefly, the order of teaching that, would start with concept of 'limits', especially the subtle outcomes obtained by repeating a function...even extrapolating to case, when your parameter goes on 'forever'.
Like, for example, take a '1' divide it in half, and keep repeating....that easy example helps understand the non-intuitive concept of limits...
The other two concepts, up the ladder of expertise, are the derivative, (best taught first), and then the Integral. Those two are complementary processes, as your derivative, (or rates of change), can be processed, to obtain integral, although first step is incomplete, in that there will be, also, some constants to solve.
Anyway, the teaching of this math, or mis-teaching, has always been a pet-peeve of mine!
Others, in school, have, actually, hired me, for short stints, helping sort out homework and helping study for tests.
PM me questions OK too, even if I'm busy, (might take day or two for response, lol)
- Rick