Web and browser
- Web Hacking 101 by Peter Yaworski.
- Breaking into Information Security: Learning the Ropes 101 by Andy Gill.
- The Web Application Hacker’s Handbook: Finding and Exploiting Security Flaws by Dafydd Stuttard and Marcus Pinto.
- Tangled Web by Michal Zalewski.
- OWASP Testing Guide v4 by OWASP Breakers community.
Mobile
- The Mobile Application Hacker's Handbook by Dominic Chell et al.
- iOS Application Security: The Definitive Guide for Hackers and Developers by David Thiel.
Cryptography
- Crypto 101 by Laurens Van Houtven.