learning centos 7

so, guys, I have decided to start my journey to become knowledgeable about servers and server management I don't really have any previous knowledge on server management but since centos are probably the most popular server os I have decided to get familiar with centos 7 as much as possible before moving to web applications. So if anyone has access newbie course on centos 7 or anything I can learn from, it has to be for beginners please send it my way.

CentOS 7 Linux Server Cookbook - Second Edition from O'Reilly.