Replied to a post by Greg McVerry (INTERTEXTrEVOLUTION)

Looking at these templates may help in quest for custom rss feeds.

If it helps, I was just digging into something like that last week. They’re a bit more tutorial/step-by-step than delving into raw code, but relatively workable for creating custom feeds.

https://boffosocko.com/2018/07/29/easy-custom-feeds-in-wordpress-digging-into-wordpress/
https://boffosocko.com/2018/07/30/customizing-wordpress-feeds-digging-into-wordpress/