Meta Title

By default, the website meta title will appear like this, inside header.php:

<?php set_document_title('title', ' / ', 'sitename', ' - ', 'description'); ?>

Usage:

To change the format of the title, you can use this hook:

add_filter('set_document_title_parts', function ($parts) {
  return ['title', ' - ', 'sitename', ' - ', 'description'];
});