I started to learn machine learning from Andrew Ng’s course. I knew the course doesn’t teach the math behind comprehensively. I started to study statistical learning at the same time. At the beginning it helped me to understand the concepts and math behind the ideas we are introduced. But now it’s like two of them approaching to same problem from different sides. Should I continue to study statistical learning in this case? Would you have any recommendations? which resource should I use to learn the math behind?