How to automatically insert a list of related articles below the post

related post by category in single below thepost

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/*How to automatically insert a list of related articles below the post*/
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function wptuts_more_from_cat( $title = "More From This Category:" ) {
    global $post;
    // We should get the first category of the post
    $categories = get_the_category( $post->ID );
    $first_cat = $categories[0]->cat_ID;
    // Let's start the $output by displaying the title and opening the <ul>
    $output = '<div id="more-from-cat"><h4>' . $title . '</h4><hr>';
    // The arguments of the post list!
    $args = array(
        // It should be in the first category of our post:
        'category__in' => array( $first_cat ),
        // Our post should NOT be in the list:
        'post__not_in' => array( $post->ID ),
        // ...And it should fetch 5 posts - you can change this number if you like:
        'posts_per_page' => 3,
        'orderby' => 'rand',
    );
    // The get_posts() function
    $posts = get_posts( $args );
    if( $posts ) {
        $output .= '<ul>';
        // Let's start the loop!
        foreach( $posts as $post ) {
            setup_postdata( $post );
            $post_thumb = get_the_post_thumbnail();
            $post_title = get_the_title();
            $permalink = get_permalink();
            $output .= '<li class="col-lg-4 col-md-4 col-sm-4 col-xs-12"><a href="' . $permalink . '" title="' . esc_attr( $post_title ) . '">' . $post_thumb . '</a><a href="' . $permalink . '" class="more-from-cat" title="' . esc_attr( $post_title ) . '">' . $post_title . '</a></li>';
        }
        $output .= '</ul><div class="clearfix"></div>';
    } else {
        // If there are no posts, we should return something, too!
        $output .= '<p>Sorry, this category has just one post and you just read it!</p>';
    }
    // Let's close the <div> and return the $output:
    $output .= '</div>';
    return $output;
}