Linux is the best-known and most-used open-source operating system. As an operating system, Linux is software that sits underneath all of the other software on a computer, receiving requests from those programs and relaying these requests to the computer’s hardware.
The code used to create Linux is free and available to the public to view, edit, and—for users with the appropriate skills—to contribute. It is also incredibly customizable because not just applications, such as word processors and web browsers, can be swapped out. Linux users also can choose core components, such as which system displays graphics and other user-interface components.
The 5 free resources to learn Linux System Administration are as follows:
1. Introduction to Linux
Never learned Linux? Want a refresh? Develop an excellent working knowledge of Linux using both the graphical interface and command-line across the prominent Linux distribution families. This coursework covers all the basic needs to start with Linux. Note and videos are also provided in the coursework.
Created by Edx.
2. Learn the ways of Linux
This tutorial covers everything Linux-related. Everything is appropriately arranged and structured to avoid confusion. The UI of this tutorial looks very clean, so users can jump right into what they want to learn. The site is equally suitable for both beginners and advanced learners. It also provides additional resources like E-Books.
Created by Linux Journey.
3. Linux System Administration Basics
This guide presents a collection of common issues and useful tips for Linux system administration. Whether you’re new to system administration or have been maintaining systems for some time, this collection of basic Linux commands will help you manage your system from the command line.
Created by Linode.
4. Linux Shell Scripting Tutorial
In the playlist, you'll find tutorials on UNIX/Linux Shell Programming. The tutorials are designed to benefit beginners, but experienced shell programmers may also learn a few tricks of the trade in the course. The playlist consists of 62 videos, each 4-10 minutes long, and it will give a clear idea about how to do Linux Shell Scripting.
Created by The Bad Tutorials.
5. Bash Reference Manual
A complete reference manual for intermediate and advanced developers to clear their doubts on Linux concepts. The manual has a very minimalistic design. However, the website is very straight to the point focusing only on the subject. Everything Linux-based can be found here.
Created by case.edu.