I use tt-rss to read RSS feeds. It can even send you an email every morning with a list of the latest posts all the RSS feeds that you track.
Here are some ways you can get RSS feeds - even from websites that don’t display or publish or promote them by default:
You can track various sub-reddits via RSS (in chronological order, no less). I think that’s natively supported on reddit.
You can use tools such as Granary to convert “social media feeds” into RSS (Eg. Feeds of people you might follow on Twitter or Mastodon to RSS).
Friendica allows you to combine all your feeds in one place - Twitter, ActivityPub, RSS and more. You then get a single place to view all of these on your own server.
I remember these… as also FreshMeat and LinuxToday (which seems to around today as well).