There are many of us who build unsecured websites or compromise the integrity of our servers by being just human. A view sites have been setup hacker test a site against intrusion.
These sites are free, safe and legal training ground for admins to test and expand their skills. More than just another hacker wargames site, we are a living, breathing community with many active projects in development, with a vast selection of hacking articles and a huge forum where users can discuss hacking, network security, and just about everything.
The first test is for newbies, web page designers. If you can't past this first test then I guess you can't secure anything.
http://n00bhackertest.googlepages.com/index.html
Not for the week hearted or feeble minded. This segment may take days, weeks, months, and even years, if you have no imagination. Skill is not everything here.
Javascript, CSS, and Brains are required to get past this test
http://www.hackertest.net
Good reading resources may be found here:
http://www.hackthissite.org/
Guides provided by National Security Agency (NSA)
http://www.nsa.gov/snac/
NB: Remember to post your progressNeither these sites nor the author is endorsing the unethical use of hacking, cracking or any such activities. This site is only for educational purposes. The correct word for this site is actually not hacking, but cracking.