Oof that makes me wonder…
I explain the whole creation story in a book the character is reading. That's technically not info-dumping since it's one topic, right? A little cliche, maybe, but I'm mostly okay with that, since I'm writing for me.
I'm talking more about author's who incorporate passages from fictional textbooks and whatnot to explain parts of the world if that makes sense. I feel like it's different with things like creation stories (and other myths/legends that are unique to your story) because it's kind of hard to get that across without someone telling/reading the story. But with things like magic systems, beliefs, traditions, unique species/races, etc. there are more interesting and quite frankly less tedious ways to explain things those kinds of aspects without going "MC needed to learn about [topic]. Here are 10 long winded paragraphs from a fictional textbook about [topic] that MC read; some of which may not even be relevant to the story." Hope that made a little more sense?
Like I said, it's not something I run into often, but for some reason I seem to be encountering it more than I would like as of late.