[psteitz]

I would start here: https://www.deeplearningbook.org/

If you already know all of the math in Part I, great, but if you don't you need to study it carefully if you want to understand what is going on. If you just want to code, there are shorter paths, but if you really want to understand the theory, you need to master the Linear Algebra and Probability material in the first part of that book. Parts II and III give a solid foundation in DL itself.