A snippet to display child pages of the current page for WordPress.

displaychildren.php

                <?php
                if ( have_posts() ) while ( have_posts() ) : the_post();
                    
                endwhile;
                $childArgs = array(
                    'post_parent' => $post->ID,
                    'post_type' => 'page',
                    'posts_per_page' => '-1',
                    'orderby' => 'menu_order',
                    'order' => 'ASC'
                );
                $child = new WP_Query($childArgs);
                if ($child->have_posts()) : while ($child->have_posts()) : $child->the_post();
                ?>

                <section class="hero">
                    <h2><?php the_title(); ?></h2>
                    <?php the_content(); ?>
                </section>

                <?php endwhile; endif; ?>