I made this cool background for my game’s menu.
I learned about shaders from the book “The Book of Shaders”  by Patricio Gonzalez Vivo and Jen Lowe, and some of my shaders were inspired by the content in that book.
The star effect was inspired by this very helpful reddit post: https://www.reddit.com/r/godot/comments/1m0czqd/starry_background_in_this_many_lines_of_shader/