It’s hard to pin down exactly how popular Linux is on the web, but recent studies estimate Unix and Unix-like operating systems power about 70% of all web servers.
At least half of those run Linux—and probably the vast majority.
If you are on a technology learning journey no matter if its back-end development, front-end or server admin it is a great skill to have know or at least have some basic knowlage around.
With over 10 years in the industry as a DBA and Sys Admin here are my top 4 resources for learning and mastering Linux/Unix
Introduction to Linux
The “Start From Scratch” Linux Course
Fundamentals of Red Hat Enterprise Linux
BONUS – Shell Scripting
If you’ve now have the knowledge of Linux move onto Shell Scripting so you can automate some of the most repetitive tasks you do