If you’re on Bluesky (like this site is!), you’re using atproto. Standard.site is, as best I understand it, a userland agreed-upon schema for what certain stuff looks like on the protocol, like a “publication” and a “document”. Mat is cautiously optimistic in trying to understand it:
The most obvious use case is allowing users on a platform like Bluesky to subscribe to an RSS-like feed of, say, blog posts, the way they would follow any other account on the service. If you tease that use case out just a little from there, it paves the the way for microblogging powered by your own website, with the content hosted and fully owned by you.
Mat got his working (as did David), which was a decent amount of work when you’re running your own build process and whatnot. Fortunately for me, I just installed the WordPress plugin, which works pretty good (notice the extra-fancy “preview card”).