Regarding Shadowrun itself, I'm interested in Lore discussions, GM discussions not about the mechanics (i e. "how do I portray Johnny Spinrad hiring our group? Tee Hee turned out wrong"), reviews of campaign/mission books, etc

I'm also interested in general GMing content like the "onion plots", "lazy gm" approach or "how to do combat like a dolphin"

Since you chose that comment to ask your question, I'll expand on what I'm complaining about. Content I have problem with is a title that sounds like it might be the general advice but then suddenly "this monster has the following stats, so that's how you put it against your players in a smart way". It's great that it exists and I'm sure anyone playing D&D can take a lot from articles like this. But it's of no use for me and from my perspective there's a lot of content like this.
Hence in general I tend to avoid the "general RPG" spaces because most of the links I find there turn out to be not for me, and only after I start reading. And I get it that it might sound over the top that I complain about needlessly reading a paragraph or two. But with the amount of backlog that I have, the proportions of what topics interest me vs those which don't and the rate at which unread content grows - yes, every click counts for me