I can't give you a proper technical answer lol, but you know like when a blog has a new post. You can subscribe to that and it'll pop up. So yeah you can follow a bunch of blogs and it'll come up as notifications when new stuff is posted.

I'm.sure someone will give you a better answer tho lol.

(I suppose this is a RSS feed, as is twitter?) 

 no actually your response made a lot of sense, thank you <3 

 So yeah, you can subscribe to substacks, blogs and whatnot. And it will show up on your nostr feed.:) 

 Here you go technical explaination 😋
https://xkcd.com
vs
https://xkcd.com/rss.xml

websites have a file for rss - its just a text file with links and content that updates whenever the owner publishes something new.

rss readers listen for the change and then pull in the data, putting most recent posts in front. 

 Really Simple Syndication. A web document you can request, like a web page, that helps users/apps track updates to other pages without having to visit each page individually. Usually includes a summary and metadata like publishing dates. Commonly used to distribute news headlines, blog posts, audio/video updates. 

 https://en.wikipedia.org/wiki/RSS