how to delete/remove wordpress feed urls in header?

You can add this code in your WordPress theme/plugin. to remove all the unnecessary tags from head including WordPress feed tags.

Github Gist URL: https://gist.github.com/coder618/29782921f79235f26285847916c2a122

add_action( 'after_setup_theme', 'prefix_remove_unnecessary_tags' );

function prefix_remove_unnecessary_tags(){

    // REMOVE WP EMOJI
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('wp_print_styles', 'print_emoji_styles');

    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
    remove_action( 'admin_print_styles', 'print_emoji_styles' );


    // remove all tags from header
    remove_action( 'wp_head', 'rsd_link' );
    remove_action( 'wp_head', 'wp_generator' );
    remove_action( 'wp_head', 'feed_links', 2 );
    remove_action( 'wp_head', 'index_rel_link' );
    remove_action( 'wp_head', 'wlwmanifest_link' );
    remove_action( 'wp_head', 'feed_links_extra', 3 );
    remove_action( 'wp_head', 'start_post_rel_link', 10, 0 );
    remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 );
    remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 );
    remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
    remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );
    remove_action( 'wp_head',      'rest_output_link_wp_head'              );
    remove_action( 'wp_head',      'wp_oembed_add_discovery_links'         );
    remove_action( 'template_redirect', 'rest_output_link_header', 11 );

    // language
    add_filter('multilingualpress.hreflang_type', '__return_false');
}

I’ve recently had a need to remove the feed url link elements and in trying to avoid customising the core WordPress functions the following solutions works.

Ensure you have a functions.php file in your theme directory that you are using. If not create the file and edit the file. The following lines will help remove select lines from your wp_head() function:

<?php
remove_action( 'wp_head', 'feed_links_extra', 3 ); // Display the links to the extra feeds such as category feeds
remove_action( 'wp_head', 'feed_links', 2 ); // Display the links to the general feeds: Post and Comment Feed
remove_action( 'wp_head', 'rsd_link' ); // Display the link to the Really Simple Discovery service endpoint, EditURI link
remove_action( 'wp_head', 'wlwmanifest_link' ); // Display 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', 10, 0 ); // prev link
remove_action( 'wp_head', 'start_post_rel_link', 10, 0 ); // start link
remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 ); // Display relational links for the posts adjacent to the current post.
remove_action( 'wp_head', 'wp_generator' ); // Display the XHTML generator that is generated on the wp_head hook, WP version
?>