slowtwitch-wp-theme/functions.php

<?php
add_action('after_setup_theme', 'slowtwitch_theme_support');

function slowtwitch_theme_support() {
    add_theme_support('title-tag');
}

add_action('wp_enqueue_scripts', 'slowtwitch_register_styles');

function slowtwitch_register_styles() {
    wp_enqueue_style('slowtwitch-styles', get_template_directory_uri() . '/style.css', array('slowtwitch-skeleton', 'slowtwitch-normalize'), wp_get_theme()->get('version'), 'all');
    wp_enqueue_style('slowtwitch-skeleton', get_template_directory_uri() . '/assets/css/skeleton.css', array(), '1.0', 'all');
    wp_enqueue_style('slowtwitch-normalize', get_template_directory_uri() . '/assets/css/normalize.css', array(), '1.0', 'all');
}

add_action( 'init', 'slowtwitch_menus' );

function slowtwitch_menus() {
    $locations = array(
        'primary' => 'Primary Menu',
        'footer' => 'Footer Menu'
    );

    register_nav_menus($locations);
}

?>