Null Byte Articles on Fixing Vulnerabilities?

Before anyone comments some snide remark like, "There's a search bar for a reason", I have checked Null Byte for anything pertaining to fixing vulnerabilities. However everything I find seems to be about creating these exploits or exploiting them.

I understand the importance of knowing how to launch attacks, but let's say I want to be able to help fortify my website or such. Can someone link me to other sites detailing how to fix vulnerabilities?