config Folder Basics
The config folder is located at ci/application/config. (where ci is the CodeIgniter code you downloaded)
The files that I have come into contact so far are:
autoload.php
config.php
database.php
routes.php
routes.php I have never really modified anything inside of it yet - I just know that "routes" in the web_development/web_framework world is for describing what page gets loaded when a url like http://yoursite.com/whichPage gets called. Read up on URI's.
autoload.php is for autoloading libraries such as "database" or "url" instead of having to do something like "$this->load->library('database');" inside every controller that you use the library for.
config.php has some general configuration settings like the base url for your website (useful if you're working locally) and this is where you change the option to get rid of the annoying "index.php" in your url too.
database.php - my experience with this has been saving database information (host name, username, password, etc) so that when I connect to a database in three of my controllers, I don't need to put that information inside the controller. I can simply call "$q = $this->db->get('table name');" and it knows the database name and also the database information for logging in.
