Raspberry Pi Pico Resource Megathread

I'm (@paper_mint@retrolemmy.com) aggregating some tutorials, libraries, and parts for the raspberry pi pico. I'm in the process of making a chiptune tracker on the pi pico and as I've been researching I've gathered a lot of links and stuff. So I figured I'd compile it into a public thread. Also its just a nice format to be able to go through myself. if someone could lmk if they know something similar that already exists that would be awesome & could potentially merge resources with it