I'm sorry in advance if I'm taking too much of your time.

#2: coding is my hobby and have been writing well designed apps for a long time, so thats not an issue

#3: ISLR is teaching how to do ML algo in R, so there goes that point

#1 is what I'd like more information. Good important is the maths to work as a data scientist? I'm planning ISLR and then maybe ESL or some advance course

A few of my friends work on Data science and they said that maths isn't that important as in, one needs to know the formulas and why things work the way they do as in not rote learning the math.

It'd be great if you can list down intermediate courses, the learning market has drowned good tutorials and books with not so good guides!