Mastering Linux Administration
Alexandru Calcatinge & Julian Balog
Offensive Shellcode from Scratch
Rishalin Pillay
Linux iptables Pocket Reference
Gregor N. Purdy
Linux Bible (10th edition)
Christopher Negus
Electronics for Beginners
Jonathan Bartlett
Wireless Network Simulation
Henry Zárate Ceballos & Jorge Ernesto Parra Amaris & Hernan Jiménez Jiménez & Diego Alexis Romero Rincón & Oscar Agudelo Rojas & Jorge Eduardo Ortiz Triviño
Linux Containers and Virtualization
Shashank Mohan Jain
Practical Ansible
Vincent Sesto
A Complete Guide to Burp Suite
Sagar Rahalkar
Quick Start Guide to Penetration Testing
Practical LXC and LXD
Senthil Kumaran S.
Wireshark Fundamentals
Vinit Jain
Cloud Attack Vectors
Morey J. Haber & Brian Chappell & Christopher Hills