Hello, check some free tutorials on IT Security and related subjects:

Write your own debbuger and learn how to use shellcodes techniques
http://hakin9.org/reverse-engineering-tutorials-2/

Do you know how to use Hydra? Cross-site scripting and many more
http://hakin9.org/hakin9-offensive-p...s-and-friends/


Everything that beginner should know about hacking
http://hakin9.org/hacking-for-beginners/

How to exploit Android with metasploit? Defending layer 2 attacks, and how to make sure that your Wordpress site is not exposed to any hack attack?
http://hakin9.org/the-guide-to-backtrack/

Metasploit's secrets on 180 pages
http://hakin9.org/metasploit-tutorials-compedium/

Why is NMAP so efficent? How to use it properly for your purpose?
http://hakin9.org/nmap-guide-revisited/

How to exploit SAP? Practical guidance
http://hakin9.org/a-guide-to-sap-exploit-2/

HTML hacking, How to perform MITM attack - step by step
http://hakin9.org/advanced-web-attac...-exploitation/

Last but not least - a beginner's guide to software exploitation
http://hakin9.org/software-exploitation-starter-kit/

Is your WI-FI really that safe?
http://hakin9.org/wireshark-compendium/