/**
* Enqueue fontawesome
*/
function my_load_scripts(){
wp_register_style('fontawesome_css', 'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/all.min.css');
wp_enqueue_style('fontawesome_css');
}

add_filter('wp_enqueue_scripts', 'my_load_scripts');