wp-fast-ajax-shortinit-custom-ajax-actions.php

<?php
// File: /wp-content/themes/my_theme/includes/ajax-actions.php

add_action('wp_ajax_my_action', 'hwk_ajax_my_action');
add_action('wp_ajax_nopriv_my_action', 'hwk_ajax_my_action');
function hwk_ajax_my_action(){
    
    // is_user_logged_in()
    // current_user_can()
    // get_userdata()
    // get_users()
    
    // get_post()
    // get_posts()
    
    // get_page_by_path()
    // get_the_title()
    // get_permalink()
    // get_post_field()
    // ...

}