If you don't think Linux skills are relevant, consider this: Linux system basics power Android devices, servicing half the world's smartphones and tablets. It's also the OS of choice for many of the world's largest mainframes and supercomputers. That said, any burgeoning IT professional should have a solid understanding of the Linux OS.

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Learn Linux in 5 Days: Your Linux introduction created with the beginner in mind. Understand basic Linux programming, commands, configurations and installation.

Learning Ubuntu Linux Server: An 11-step guide to getting your first Ubuntu Linux server up and running, perfect for any home office or small business.

Learn to Run Linux Servers From Scratch: Add certified Linux administrator to your resume while prepping to pass the LPIC-1 Exam 101 certification exam.

Learn to Run Linux Servers Part 2: Continue your Linux server deep-dive, mastering advanced admin and security functions as well as specialized customization and installation.

Pentester Certification Course: Cover up your server's vulnerabilities with this detailed pentester overview.

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