source: bridal-jewelry-store/1.3/single.php

<?php

/**
 * The template for displaying all single posts
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
 *
 * @package bridal_jewelry_store
 */

get_header();
?>
<main id="primary" class="site-main">

        <?php
        while ( have_posts() ) :
                the_post();
                get_template_part( 'template-parts/content', 'single' );

                do_action( 'bridal_jewelry_store_post_navigation' );

                if ( is_singular( 'post' ) ) {
                        $bridal_jewelry_store_related_posts_label = get_theme_mod( 'bridal_jewelry_store_post_related_post_label');
                        $bridal_jewelry_store_cat_content_id      = get_the_category( $post->ID )[0]->term_id;
                        $bridal_jewelry_store_related_posts_count = get_theme_mod( 'bridal_jewelry_store_related_posts_count');

                        $args                = array(
                                'cat'            => $bridal_jewelry_store_cat_content_id,
                                'posts_per_page' => $bridal_jewelry_store_related_posts_count,
                        );

                        $query = new WP_Query( $args );

                        if ( $query->have_posts() ) :
                                ?>
                                <div class="related-posts">
                                        <?php if ( get_theme_mod( 'bridal_jewelry_store_post_hide_related_posts', false ) === false ) : ?>
                                                <h2><?php echo esc_html( $bridal_jewelry_store_related_posts_label ); ?></h2>
                                                <div class="row">
                                                        <?php
                                                        while ( $query->have_posts() ) :
                                                                $query->the_post();
                                                                ?>
                                                                <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
                                                                        <div class="mag-post-single">
                                                                                <div class="mag-post-img">
                                                                                        <?php bridal_jewelry_store_post_thumbnail(); ?>
                                                                                </div>
                                                                                <div class="mag-post-detail">
                                                                                        <?php the_title( '<h5 class="entry-title mag-post-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h5>' ); ?>
                                                                                        <div class="mag-post-excerpt">
                                                                                                <?php the_excerpt(); ?>
                                                                                        </div>
                                                                                </div>
                                                                        </div>
                                                                </article>
                                                                <?php
                                                        endwhile;
                                                        wp_reset_postdata();
                                                        ?>
                                                </div>
                                        <?php endif; ?>
                                </div>
                                <?php
                        endif;
                }

                // If comments are open or we have at least one comment, load up the comment template.
                if ( comments_open() || get_comments_number() ) :
                        comments_template();
                endif;

        endwhile; // End of the loop.
        ?>

</main>
<?php
if ( bridal_jewelry_store_is_sidebar_enabled() ) {
        get_sidebar();
}
get_footer();