[joenot443]

https://www.youtube.com/@InigoQuilez/videos is what I'm talking about. It's not necessarily a from-zero introduction, but it's a nice resource.

https://www.youtube.com/watch?v=0ifChJ0nJfM is probably the the most beginner friendly.

https://thebookofshaders.com/ is another great place to start.

Good luck and enjoy!