I have a general question to help me understand how this template works. For example, in the menu.php file the following code exists:
<?php do_action( 'vantage_before_masthead' ); ?>
I have a basic (very basic) understanding of php. What I don't get is what the 'vantage_before_masthead' is referencing. Is this a method/function that has been defined elsewhere? If so, where and how does the browser know where to find it? These 'vantage_before_...' and 'vantage_after_...' are everywhere and I can't seem to figure out what they are doing.
Any help from anyone would be greatly appreciated!!