wp_title

Can you explain more Easily, how do I use this code, I found this code from https://developer.wordpress.org/reference/functions/wp_title/#

Covering Homepage
If you are using a custom homepage with custom loops and stuff or a custom front-page, you will have an empty wp_title. Here goes a neat hack to add the description/tagline at the wp_title place on homepage:

<title><?php wp_title(”); ?></title>
Then in your functions.php file in your theme:

add_filter( ‘wp_title’, ‘wpdocs_hack_wp_title_for_home’ );

/**
* Customize the title for the home page, if one is not set.
*
* @param string $title The original title.
* @return string The title to use.
*/
function wpdocs_hack_wp_title_for_home( $title )
{
if ( empty( $title ) && ( is_home() || is_front_page() ) ) {
$title = __( ‘Home’, ‘textdomain’ ) . ‘ | ‘ . get_bloginfo( ‘description’ );
}
return $title;
}