This plugin with create a related post block with a simple shortcode.
You can configure the title, description and image of each post (by default will use the title, first content words and featued image of the post)
You can setup few global options to change the visual aspect of the block.
Visit the official wordpress plugin page: https://wordpress.org/plugins/mejorcluster/
[mejorcluster]
[mejorcluster posts="20,2,9,51,55,59,63,67,71"]
[mejorcluster parent="2,3,4"]
[mejorcluster categories="3,4"]
[mejorcluster categories="3" exclude="101"]
[mejorcluster tags="4,5"]
[mejorcluster parent="post_parent"]
[mejorcluster parent="post_parent" exclude="self"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" round="yes" shadow="yes" skip_title="no"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" skip_title_link="yes"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" skip_image_link="yes"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" title_tag="h3"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" desc_tag="h5"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" title_maxwords="2"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" desc_maxwords="50"]
Use the same name than the wordpress size name (i.e. medium, large, etc)
[mejorcluster imagesize="large"]
[mejorcluster posts="20,2,9,51,55,59,63,67,71" grid="3" maxitems="9"]
[mejorcluster posts="20,2,9,51" grid="1" classname="clusterlist" maxitems="9" skip_image="yes" shadow="no" skip_title_link="no" skip_desc="yes"]