What are some prior knowledge required to get started in CodeIgniter?

[eluser]xwero[/eluser]
Knowledge you can pick up as you go along. Willing to think about code separation and code reuse is more important.

A CMS is an application, a framework is the base of the application so you are going to have to do a lot of the legwork a CMS already does for you. But on the other hand your applications based on a framework don't have to follow the CMS structure.