Do you want a good reason to learn about Linux? I'll give you one: According to Dice, the leading career site for technology and engineering professionals, pros.
This, is available for free. That's not bad for a class that usually runs $2,400!
This massively open online course (MOOC) is being taught by Jerry Cooperstein. Cooperstein is a nuclear astrophysicist who's been using Linux since 1994 and teaching it for almost that long.
You don't need a Ph. D. to learn Linux and you don't need to have previous Linux experience to enroll. If you know your way around a PC, you're qualified to take the class.
You can audit the course, take it for a certificate, or take and pass the class for an edX personalized Certificate of Achievement. This last option costs $250. This certificate can be used for job applications, promotions or school applications. To earn one, you'll need to be ready to devote 40 to 60 hours to the class.
This class looks at Linux from a very high level. You'll be able to use Linux distributions from any of the three major Linux families, including Red Hat, with Fedora or CentOS; Debian, including Ubunt or Mint; and SUSE, including openSUSE.
This course will cover the various tools and techniques commonly used by Linux programmers, system administrators and end users to do day-to-day work in Linux.
After completing the class you should have a good working knowledge of Linux, from both a graphical and shell perspective. You should then be able to easily navigate through any of the major Linux distributions. From here, you should be able to continue your progress as either a user, system administrator or developer. Enjoy!