Enqueue Font Awesome 5 in WordPress

functions.php

<?php

// Enqueue Font Awesome 5 in WordPress 
function tme_load_font_awesome() {
    // You can find the current URL for the latest version here: https://fontawesome.com/start
    wp_enqueue_style( 'font-awesome-free', '//use.fontawesome.com/releases/v5.6.3/css/all.css' );
}
add_action( 'wp_enqueue_scripts', 'tme_load_font_awesome' );