for VR, not sure what there is to learn it’s just regular R but rendered twice! unless you mean UX guidelines, then these: learn.unity.com/tutorial/vr-best-practice developer.oculus.com/documentation/mobilesdk/1.0.3/concepts/mobile-ui-guidelines-intro/
when i was learning VEG i found the official forums pretty decent, looks like there is one for shader graph as well
forum.unity.com/threads/feedback-wanted-shader-graph.511960/
rope-learning, this is probably too basic for you but again official unity tutorials plus download and examine official unity assets
unity3d.com/pt/learn/tutorials/s/roll-ball-tutorial
they have helpfully scattered their assets across an asset store a package manager and github but here is some sample shaders to study
github.com/UnityTechnologies/ShaderGraph_ExampleLibrary
i would be wary of studying their high-profile demos like ADAM though they write bespoke just-for-demo systems that never ship plus those projects are kinda a mess to navigate (smells like trade show demo deadline stress)
more sample shaders: github.com/keijiro/ShaderGraphExamples
lastly, realtime vfx forum often posts WIP of effects made in shader graph… sometimes will post the graph itself as well
brackeys has some ok effects done in shader graph
another official talk, from gdc
but don’t see paid classes on shader graph yet (one on old text-based shaders tho)
hope that helps!