I've been in an Ansible Solutions Architect (SA) role at Red Hat for about a year, but I still learn new things about Ansible every day.
When I explored ARA I first became familiar with Ansible Callbacks (that get called at the conclusion of tasks, plays, etc.) And I've been needing to make some modifications (filters, etc) to the PLAY RECAP at the end of an Ansible play. Note that there are numerous callbacks pre-written listed here, but occasionally you need to write a custom one. In this case, I just wanted a better understanding of what those pre-written ones can do. And, lo and behold, there's a nicely documented page that shows you that.
Thank you Random Hero.