What book about Linux (preferably RedHat) would you recommend?

Question

linux

Hello, habrchane
To the best of your kind of occupation, you need a booklet related to the administration of Unix systems , preferably RedHat , and there, of course, how it will turn out, so I’ll ask you for advice, which one to buy? It is desirable that the content should also be about: firewall , services , access to files / directories , packages , etc., in general, I hope I formulated it correctly.
Thanks

Answer 1

RHCSA/RHCE Red Hat Linux Certification Study Guide (Exams EX200 & EX300), 6th Edition (Certification Press) 6th Edition by Michael Jang (Author)

Answer 2

Nemeth comrades of course. The price is really hefty.

Answer 3

Linux in action