Fontawesome icons are not the nicest looking icons out there. We like these more:

Icons8 have a nice alternative that can be included with a single external cdn css file

wp_enqueue_style( 'icons8', '//maxst.icons8.com/vue-static/landings/line-awesome/line-awesome/1.3.0/css/line-awesome.min.css', array(), '1.3.0');

Ionicons is also a cool favorite that can be included as an external cdn js file

wp_enqueue_script('ionicons', '//unpkg.com/ionicons@5.5.2/dist/ionicons/ionicons.js', NULL, '5.5.2', true);