The process of testing and fixing a website?

[eluser]Jason Hamilton-Mascioli[/eluser]
To test a website from the user's perspective, setup scenarios (and document exactly how to do this) with their assumed outcomes. Then actually go to the site and follow your guide and note if the site passed or failed. This can be automated using Selenium ... http://seleniumhq.org/

Testing the actual code is done via unit testing. There are many topics and different types of unit testing depending on language and framework.