by Michael Sikorski & Andrew Honig: The industry standard for learning how to safely dissect and understand malicious software.
by OccupyTheWeb : Widely considered the most practical introduction to Linux for security. It covers command-line basics, scripting, and networking tools within the Kali Linux environment. index of hacking books best
Once you understand the basics, these "bibles" of offensive security teach you how to identify and exploit vulnerabilities. by Michael Sikorski & Andrew Honig: The industry