This members-only tutorial provides the steps to show 12 related posts (based on tags first and then categories) and show 3 at a time as a slider/carousel using Flickity on single posts in Oxygen.
From 767px and below, we will change 3 items per view to 2 per view and from 479px and below, 1 at a time.
This can also be applied to entries of a Custom Post Type with corresponding custom taxonomies.