Your WordPress website is made up of two elements: a WordPress database, and your WordPress files. Wp-config.php is the one element that links the database and files together.
If you're curious, we have a full guided tool of wp-config.php available.
Because wp-config.php is important, it is also the file that you most protect more than any other.
In this video, our WordPress teacher, Topher, is going to show you one simple trick to keep your wp-config.php safe.