Show related wordpress posts without plugin

Displaying related posts is a very great way to help visitors staying longer on your blog. You can use a plugin, but you also can use tags and a custom code to show related posts. This code will display related posts based on the current post tag(s). It must be pasted within the loop.   <?php //for use in the loop, list 5 post titles related to first tag on current post $tags = wp_get_post_tags($post->ID); if ($tags) {   echo 'Related Posts';   $first_tag = $tags[0]->term_id;   $args=array(     ‘tag__in’... [Read the full story]