Linux Firewalls
Michael Rash
C++ Crash Course
Josh Lospinoso
Wireless Hacking with Kali Linux
Hugo Hoffman
Linux Bible (10th edition)
Christopher Negus
Burp Suite Cookbook
Sunny Wear
Mastering Linux Network Administration
Jay LaCroix
Mastering Linux Administration
Alexandru Calcatinge & Julian Balog
Offensive Shellcode from Scratch
Rishalin Pillay
The Complete Metasploit Guide
Sagar Rahalkar