Things I don't want to (try and) remember? Forward to a telegram group I own, aptly called "my nerd drawer". I have friends on that group too, so they get to see the nerdy stuff I 'save'.
Things I do want to remember? I make notes on anki. Note not all of this is for the memorization function intended by anki. Some of it is just (linked) references. So in some way, I've become very adept in using anki in the same way others use obsidian, for instance, and have come to prefer it. Most of it is indeed things I want to keep relatively fresh and do spaced repetition on though. Every single time I didn't invest the time to convert something I wanted to remember into an anki note I've come to regret it.