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There are many versions of linux - determine which one you want to master and look for course and certifications in it. &nbsp;Common ones are Red Hat, Suse, and Debian, but there are many others and most are based either on Red Hat or Debian (that is, they are very similar to one of those two).
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There are many versions of linux - determine which one you want to master and look for course and certifications in it.  Common ones are Red Hat, Suse, and Debian, but there are many others and most are based either on Red Hat or Debian (that is, they are very similar to one of those two).

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I am interested in CentOS, I am willing to pay for online courses but if there is good free material that you know about it, will be perfect, even a book that you could recommed.<br />
<br />
Regards.
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I am interested in CentOS, I am willing to pay for online courses but if there is good free material that you know about it, will be perfect, even a book that you could recommed.

Regards.

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CentOS is similar to RedHAT and they are supported by RedHAT only.<br />
<br />
You can go for RHCSA/RHCE.
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CentOS is similar to RedHAT and they are supported by RedHAT only.

You can go for RHCSA/RHCE.

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HI<br />
<br />
I am new at Linux, I have learned something about it, reading some here, some there but I would like to formalize the knowledge in order to became a good server administrator.<br />
<br />
Could you recommend a tutorial, course or even a good book about it?<br />
<br />
Thanks in advance.
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HI

I am new at Linux, I have learned something about it, reading some here, some there but I would like to formalize the knowledge in order to became a good server administrator.

Could you recommend a tutorial, course or even a good book about it?

Thanks in advance.

How to Learn linux from basis

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.