Most of us professionals have very little time and stamina to read through books. We would always prefer to go through some videos and learn the subject quickly. Here are some of the online courses that I found useful.
We have many sources of online video tutorials. Coursera, Udacity, edX, Udemy, Edureka are the most popular. Each of them have good set of tutorials on most subjects that one could think of. But when it comes to machine learning, nobody can beat Coursera, that is headed by Andrew Ng himself.