I use it to follow news updates, blogs, updates of apps that I like, some youtube channels and lemmy/reddit communities.
I’m new to using rss feeds, but it seems to reduce the time to open pages on the browser to check for updates.

For example:
Feed with post titles and content from c/ Word of the Day:
https://lemmy.world/feeds/c/wotd.xml?
Lemmy has built-in rss feeds.

I also use the FdroidUpdate subreddit to follow updates. Is there a direct rss feed to follow?

Notifies me of updates for Jerboa:
https://github.com/dessalines/jerboa/releases.atom

The same for PipePipe:
https://codeberg.org/NullPointerException/PipePipe/releases.rss

PipePipe displays rss feed urls of yt channels. So I follow some local yt channels.

https://rss-bridge.org/bridge01/ - Helps to get rss feeds for services/websites that don’t have an rss feed of their own

News websites like The Guardian and The Hindu(Indian newspaper, not a religious one tho) seem to have rss feeds for specific topics and main pages.