oh oops and you can download them here: https://dantescanline.itch.io/quake-maps
Here's a permanent invite for the Quake Mapping discord:
https://discord.com/invite/j5xh8QT
Here's the youtube playlist for the best series of tutorials for new mappers:
https://www.youtube.com/watch?v=gONePWocbqA&list=PLgDKRPte5Y0AZ_K_PZbWbgBAEt5xf74aE