As many of newbies asking this quetion so for all these people who are new at this whole Scenerio and do not really understand what hacking is all about and where to begin, I offer up these links to some great places to start learning.
http://www.lessig.org/freeculture/free.html <– A speech given talking all about the problems facing culture when dealing with copyright and other digital laws.
http://www.grc.com/SecurityNow.htm <– This is fantastic for people who are new to the field. If you have the time or motivation, go back and listen to them from day 1, they assume you know very little if anything and hit on all of the major topics in the security field. Fantastic show.
http://www.antionline.com/ <– Tutorials, tools and forums full of helpful people.
The Art of Assembly Language Programming: http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html
Microsoft Developers Network: http://msdn.microsoft.com
If you are interested in websec (web security) you should pretty much understand the different protocols on the web, i.e TCP/IP, FTP, HTTP, SSH, etc.
Knowledge of HTML, PHP, ASP, SQL, Perl, and Python is good.
Watching/reading papers or videos from past conventions such as Shmoocon, DefCon, or BlackHat, is a good idea.
And last but not he least is Crazylearner.
May be some of the best site is still left. so share your best site in comment section.Please contribute to this post.
Disclaimer : This information is just for educational purpose. If someone use in malicious activity then only he is responsible for it.