When you learn something using practical approach, you can miss small fundamental bits of information. The bits can be useful or useless, but it’s always good to know them. That is the reason I scroll through many Linux tutorials every now and then. Most of them are casual, but I have to highlight a gem I recently found: the Linux basics from Daniel Robbins. They are perfectly structured and there were some points I missed during my self-education.
The articles in Linux Fundamentals series are focused on Linux basics and position themselves as tutorial for preparation to LPI exams. I wouldn’t consider the tutorials as robust exam preparation guide – exam topics are wider than the ones discussed in tutorial. But tutorials are still very good. They are written in a very good easy language with nice input of nerd humour.
http://www.funtoo.org/en/articles/linux/lpi/1
http://www.funtoo.org/en/articles/linux/lpi/2
http://www.funtoo.org/en/articles/linux/lpi/3
http://www.funtoo.org/en/articles/linux/lpi/4
There are few more topic oriented tutorials written by Daniel, like BASH, SED, AWK guides. There is a file system guide for the ones who does not know which file system to choose . I’m too lazy to publish all direct link to the articles here. Just open http://www.funtoo.org/ page and scroll down. You’ll find all you need.