WordPress register navigation menus and image sizes

navim.php

function univer_features() {
    register_nav_menu('headerManuLocation', 'Header Menu Location');
    register_nav_menu('footerLocation1', 'Footer Menu Location 1');
    register_nav_menu('footerLocation2', 'Footer Menu Location 2');
    add_theme_support('title-tag');
    add_theme_support('post-thumbnails');
    add_image_size('professorLandscape', 400, 260, true);
    add_image_size('professorPortrait', 480, 650, true);
    add_image_size('pageBanner', 1500, 350, true);
}

add_action('after_setup_theme', 'univer_features');

//Inserting menu
wp_nav_menu(array(
   'theme_location' => 'headerManuLocation'
));