remove_action('wp_head', 'feed_links_extra', 3); // Displays the links to the extra feeds such as category feeds
remove_action('wp_head', 'feed_links', 2); // Displays the links to the general feeds: Post and Comment Feed
remove_action('wp_head', 'rsd_link'); // Displays the link to the Really Simple Discovery service endpoint, EditURI link
remove_action('wp_head', 'wlwmanifest_link'); // Displays the link to the Windows Live Writer manifest file.
remove_action('wp_head', 'index_rel_link'); // index link
remove_action('wp_head', 'parent_post_rel_link'); // prev link
remove_action('wp_head', 'start_post_rel_link'); // start link
remove_action('wp_head', 'adjacent_posts_rel_link_wp_head'); // Displays relational links for the posts adjacent to the current post.
remove_action('wp_head', 'wp_generator'); // Displays the XHTML generator that is generated on the wp_head hook, WP version