An accessible introduction to not just comics, but a slew of ideas about art in general. I read it as a bookish child sometime in Primary School, and I'd happily reread it now at nineteen.
Existential Comics has some really incredible comics with themes both silly and poignant. The very first comic (linked) is one I think about all the time.
Finally got around to printing off a bunch of the essays and articles that I had saved on my computer for a while. I find it makes it easier to get myself to actually get around to reading some of the stuff. Paper is also a nicer reading experience, with less distractions and eye strain.
Any pi.fyi rec (by someone else, not yourself) that you saw and then acted on yourself - read the book, listened to the album, watched the movie, tried the activity, etc.