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Linux is a free and open-source software (FOSS) operating systems built around the Linux kernel, packaged in a distro, by Linus Torvalds.
The main distros for the Entreprise Servers are the Red Hat RHEL, Suse SLES (based on Slackware) and Ubuntu Server (based on Debian). There is also the community version of RHEL, CentOS, Debian and Oracle Linux (based on RHEL, but with Oracle Support).
For desktop, the most common are probably fedora or ubuntu distros, but there are too manny, for different proposes, such as lubuntu, that works really well on old computers. Another worthy mention is the arch and gentoo independent distros. Highly customizable, but recomended only for advanced users. See more in this image or let distro chooser get the best linux for you.
- marolive - RHCSA: Red Hat Certified System Administrator
- Udemy - Red Hat: RHEL Technical Overview
- PAID Udemy - Jason Cannon: Linux Administration Bootcamp
- edX - Red Hat: Fundamentals of RHEL
- edX - Linux Foundation: Introduction to Linux
- Cisco netacad: Linux Essentials
- “UNIX and Linux System Administration Handbook”, by Evi Nemeth, et al
- “How Linux Works”, by Brian Ward
- FREE “The Linux Command Line”, By William Shotts
- FREE “Linux From Scratch”, by Gerard Beekmans
- FREE “Linux Insides”, by 0xAX
- Ops Schools
- Linux Journey
- Ryans Tutorials - Linux Introduction
- Linux Training, by Paul Cobbaut
- The Linux Documentation Project
- snipcademy tutorials
- Learn Enough tutorial, by Michael Hartl
- usenix conferences
- Youtube Channel: tutoriaLinux
If you wish to get certified, the standard is by Red Hat. We recomend to start with the RHCSA certification and follow our guide. As an alternative, you can check the Linux Professional Institute and Linux Foundation certification programs.
- Red Hat Certified System Administrator RHCSA
- Red Hat Certified Engineer RHCE
- Red Hat Certified Architect RHCA