There is a great class over at Hacker High School that will teach you the basics of networking and security. If you're curious about how hackers do what they do and how computer security works, you should definitely check out this free course. It is provided in thirteen PDFs free for download.

Keep in mind that this really isn't meant for anyone who has security experience, but anyone that craves information like I do might be interested in reading the lessons.

This is primarily meant for high school students that want to learn more about computer security for purposes of a career in IT. Not only does it teach about hacking but it teaches about ethics as well. Its cooler to be an ethical hacker than a malicious one, kids. Then you're subverting the subverters.