Pretty useful and well taught: React JS parts I and II in Codecademy, JavaScript promises in Udacity. Just pretty fun: Intro to Machine Learning in Udacity As

Pretty useful and well taught: React JS parts I and II in Codecademy, JavaScript promises in Udacity. Just pretty fun: Intro to Machine Learning in Udacity As a general comment, I would like to say that MOOCs tend to be superficial and that the best way to learn a new technology or paradigm is just to read the docs and try hacking on a project. However, MOOCs can be a good format to simply get a broad perspective on some topic though.