Linux is a great open source operating system. It can be used as a desktop for browsing the web, or as a stable server platform. This section is incomplete, but expect tips for beginners, outside references and etc.
http://lifehacker.com/5778882/getting-started-with-linux-the-complete-guide – Lifehacker getting started with Linux guide.
http://www.makeuseof.com/tag/a-quick-guide-to-get-started-with-the-linux-command-line/ – Another quick Linux run down.
http://www.tldp.org/LDP/intro-linux/html/index.html – Free introduction to Linux book, Introduction to Linux by Machtelt Garrels.