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Tux Machines (TM)-specific
Whether you're new to Linux or looking to become a more advanced user, there are a lot of free online books and tutorials that can give you guidance. For beginners good choices abound, and good titles are just a few clicks away. In this post, you'll find our updated collection of many good Linux reference guides online--all available at no cost.
Total Linux beginners can easily dive into The Easiest Linux Guide You'll Ever Read, and The Linux Starter Pack. Both guides cater to newbies and provide numerous useful resources.
We've covered Ubuntu Pocket Guide and Reference before here, and you can download it for free here. The online book is mostly identical to the fee-based print version, and the author, Keir Thomas, has written a number of books on Linux.