I run into the same problem, am much better at understanding maths stated as code than in mathematical notation.

3blue1brown's animated maths channel is pretty good. - https://www.3blue1brown.com/

Khan Academy's maths section covers a lot of stuff - https://www.khanacademy.org/math

math.stackexchange is excellent for specific questions - https://math.stackexchange.com/

One thing that works for me is to try and find something stated both in code and in maths notation, then you can work out one from the other.