How to use Google Fonts in WordPress, the right way

functions.php

//Better method regarding to the WordPress Codex
//Example
function my_google_fonts() {
if (!is_admin()) {
wp_register_style('google', 'https://fonts.googleapis.com/css?family=Roboto', array(), null, 'all');
wp_enqueue_style('google');
}}
add_action('wp_enqueue_scripts', 'my_google_fonts');

gistfile1.txt

//My previous version

function my_google_fonts() {
	wp_enqueue_style( 'roboto', 'https://fonts.googleapis.com/css?family=Roboto' ); 
}
add_action('wp_enqueue_scripts', 'my_google_fonts');