I was wondering if there are any branches of maths that I can work through, that don't require a very deep math background. I am working through the Calculus sequence for university so I am very limited. I know graph theory is something that I can probably work through (correct?) and I BELIEVE I read somewhere that I could work through Combinatorics and/or enumeration without knowing any maths since the postulates and axioms are self-contained. If anyone can provide to me any and all branches of maths that I could work through to broaden my knowledge, that would be chill. Peace homies!