Introduction to Linux course by The Linux Foundation on edX

I just finished (passed the final exam with 100% :D) the Introduction to Linux course by the Linux Foundation on edX (in about 1 day):

Even though I've been using Linux for almost 3 years, the course reminded me a lot of things that I rarely use. That's a really good chance to review my Linux skill.

If you wanna have some new experience and advance your career, you should check this out.