WordPress | Remove dashboard menu items

remove_menu_items.php

<?php
function remove_menus(){
    remove_menu_page( 'index.php' );                  // Dashboard -    Menu position: 2
    remove_menu_page( 'jetpack' );                    // Jetpack* 
    remove_menu_page( 'edit.php' );                   // Posts -        Menu position: 5
    remove_menu_page( 'upload.php' );                 // Media -        Menu position: 10
    remove_menu_page( 'link-manager.php' );           // Links -        Menu position: 15
    remove_menu_page( 'edit.php?post_type=page' );    // Pages -        Menu position: 20
    remove_menu_page( 'edit-comments.php' );          // Comments -     Menu position: 25
    remove_menu_page( 'themes.php' );                 // Appearance -   Menu position: 60
    remove_menu_page( 'plugins.php' );                // Plugins -      Menu position: 65
    remove_menu_page( 'users.php' );                  // Users -        Menu position: 70
    remove_menu_page( 'tools.php' );                  // Tools -        Menu position: 75
    remove_menu_page( 'options-general.php' );        // Settings -     Menu position: 80
}
add_action( 'admin_menu', 'remove_menus' );
?>

Tidy up the dashboard menu

More details here.