If you're not familiar, RSS feeds are a way to subscribe to a blog's posts. You can read these feeds in RSS reader apps like NetNewsWire. It's more chill way to consume content compared to social media feeds where you have to deal with notifications or third-party ads.
The default RSS feed will subscribe you to all items that show up on the posts page.
If you'd like to subscribe to only certain categories, you can also create your own custom feed via choosing categories below.