What is RSS?
A creek

RSS is a simple way to subscribe to blogs and podcasts without creating a user account on some specific platform. You don’t need a user account. Period. You get what you want directly from the horse’s mouth (is that an expression?). Anyway, the horse’s mouth in this case is the address: https://en.arvidmarklund.se/feed.rss.

For a more detailed technical description of the format please see https://www.rssboard.org/rss-specification.