IMO the minimum is to be able to read a “hello world / first triangle” example for any of the modern graphics APIs (OpenGL/WebGL doesn’t count, WebGPU does), and have a general understanding of each step performed (resource creation, pipeline setup, passing data to shaders, draws, synchronization). Also to understand where the pipeline explosion issue comes from.

Bonus points if you then look at CUDA “hello world” and consider that it can do nontrivial work on the same hardware (sans fixed function accelerators) with much less boilerplate (and driver overhead).