Related posts is a very popular feature & a great way to help visitors staying longer time on your blog. You can use a plugin / custom function to display related posts. Related posts has a great probability that a user will be interested in your other articles after reading one.Two different ways to display Related Posts in your wordpress blog. If you want to display the related posts with any one of the categories that the current post has, use the following code.
Also you can use alternative wordpress custom functions code inside your single.php after a loop wherever you want to show related posts,