A lot of hacking techniques are really simple, like guessing a commonly used password or using “social engineering” to get a password and other sensitive info out of a user. Another simple way to “hack” is to use Google to find misconfigured servers and scripts that are run by ignorant or lazy system administrators, and use the information from those pages to your own advantage or entertainment.

“This”:http://johnny.ihackstuff.com/index.php?module=prodreviews&func=showcontent&id=179 site happens to have a running database of these hacks. There are hundreds of queries to use to find any number of vulnerabilities. Most won’t actually give you access to anything sensitive or confidential, but they are interesting and some are even useful for non-hacking reasons.