Use an app like inoreader to discover feeds.

I personally have programmed my own and host it on web, this is what it looks like: me-cfs.github.io/yann/personalhost/newsrssfeed/

Here’s the list (in js but readable) of all my feeds, gives you an idea of what a well rounded rss feed looks like: me-cfs.github.io/yann/personalhost/…/feedlist.js