Introduction to TensorFlow - Towards Data Science

In my experience, learning to anything useful in computer science has fallen at the strange intersection of theory and practice. It's pretty easy to ignore the amount of depth that the lies under some of the things we code. Machine learning takes that to an extreme, and everyone wants to be a Machine Learning Engineer these days. Elements of Statistical Learning is a fantastic book. If you can get through it you'll know quite a bit, but it doesn't mean much if you're unable to put any of into practice.