If your motivation is to develop marketable skills since your crypto investments went belly up, then I think you're likely to find that math provides a poor ret

If your motivation is to develop marketable skills since your crypto investments went belly up, then I think you're likely to find that math provides a poor return on your investment. You're better off just learning to program and forgetting about all that higher level math, it's a tremendous amount of work, and it's not a path to riches. With regard to that math stack exchange link- I heard an interesting anecdote once, that you don't really know a particular area of math until you study what comes after it. So you don't know algebra until you study calculus, and you don't know calculus until you study analysis. The user who provided the solution in that post did his master's thesis in analytic number theory. A subject that may use relatively accessible tools, but is nevertheless notorious for its technicality. Calculus is not "just calculus", it's a deep and enduring subject, you don't become fluent in it after a few courses. It's been more than ten years since I took calculus, and nearly ten years since I myself first taught it to undergraduates, and I'm still learning calculus.