One of the most important files in your WordPress installation is the
wp-config.php file. This file is located in the root of your WordPress file directory and contains your website’s base configuration details, such as database connection information.
When you first download WordPress, the
wp-config.php file isn’t included. The WordPress setup process will create a
wp-config.php file for you based on the information you provide in the installation process.
It is unlikely that a non-developer would have to edit the wp-config.php file, in the case you are acting on trouble shooting steps provided by a technical person or by your webhost, this page should help.