Matina theme provides various hooks that the devlopers can use to add custom functionality in there theme.
Here are the example how to use hooks
Action Hook:
function custom_function_to_add() {
//Your code goes here
}
add_action( 'hook_name', 'custom_function_to_add' );
Filter Hook:
function custom_function_to_add() {
//Your code goes here
}
add_filter( 'filter_name', 'custom_function_to_add' );
For additional information, here is more detailed info WordPress hooks