How to generate custom RSS on WordPress

wp-generate-custom-feed-rss.php

<?php
/**
 * Generating your own custom RSS feed with custom URL and parameters
 */

/**
 * Initialise RSS feed
 * @see https://developer.wordpress.org/reference/functions/add_feed/
 */
function init_rss_feed_custom( ) {
    add_feed('feed_name', 'add_rss_feed_custom');
}
add_action('init', 'init_rss_feed_custom');

/**
 * Generates Events Master List Feed RSS
 * URL: /feed/?feed=alg_events_master_list
 * 
 * @see https://developer.wordpress.org/reference/functions/add_feed/
 */
function add_rss_feed_custom ( ) {
  header('Content-Type: application/rss+xml');
  ?>
      <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
          <channel>
              <title><?php bloginfo_rss('title') ?></title>
              <link><?php bloginfo_rss('url') ?></link>
              <description><?php bloginfo_rss('description') ?></description>
              <atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
              <item>
                  <description>
                  <![CDATA["Jesus is the LORD"]]>
                  </description>
                  <pubDate>Fri, 08 Nov 2019 01:56:02 GMT</pubDate>
                  <guid>https://www.website.com/post/1</guid>
              </item>
          </channel>
      </rss>
  <?php

}