Hacking - The art of exploitation
Jon Erickson
How Cybersecurity Really Works
Sam Grubb
The Hardware Hacking Handbook
Jasper van Woudenberg & Colin O'Flynn
Linux Command Line and Shell Scripting Techniques
Vedran Dakic & Jasmin Redzepagic
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert