Intro to Linux is normally a $2,400 course from the Linux Foundation, but it's being offered for free now on edX. If you've ever wanted to learn how to use the open source operating system, there's no better time than now.
The free course starts on August 1st, but to get the best experience from the class, you should install Linux on your computer before it starts. The Linux Foundation has a helpful guide for doing just that—so you can hit the ground running when the course starts in a couple of days.
Read more at Lifehacker.