WordPress feeds enable your visitors to subscribe to your content for use in their favorite feed-reader. For example, subscribing to the main-posts feed and/or the comments feed is a great way for your readers to stay current with all the latest news and content from your website.
With WordPress, you can deliver a wide variety of "Full-text" or "Summary" (partial) feeds in numerous formats, including Atom, RDF, and RSS2. This variety extends the reach of your content by enabling your feeds to be read in more apps, readers, and devices.
As awesome as the default feeds may be, they are also readily customizable using a variety of methods. In addition to WP's built-in ways of configuring your feeds, you can go even further with custom templates, functions, and plugins. In this DigWP post, you'll learn everything you need to customize your feeds with bonus content, recent posts, social media, and much more.
👓 Customizing WordPress Feeds | Digging Into WordPress
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Replied to a post by Greg McVerry (INTERTEXTrEVOLUTION)
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/