Ask HN: How to get started with machine learning?

Machine learning seems like something that's become really critical to know; unfortunately it wasn't offered at my undergrad university. Can anyone recommend some books or online courses that are good to start with?

So far I've found these, but I have no idea if they're good or not:

* https://www.coursera.org/learn/machine-learning

* https://work.caltech.edu/lectures.html