This is not a duplicate of Geometry Nodes - How to assign vertex group in geometry nodes?, because it appears that the answer is obsolete in v3.x. How sad!
I want to Instance an object (here a "Sphere") onto vertices of another object (here a "Cube") similar to Vertices Instancing onto a parent object:
Now I want to use the vertices I specified into the "Group1" Vertex Group on Cube:
I finally figure out (not through the Documentation that never describes how to get properties to Group Input!!), how to get the Vertex Group:
But I'm not sure what to do from here, as several Geometry Nodes from the previous Q/Solution are no longer available, which probably makes much of the Stack Exchange and tutorial information on Geo Nodes obsolete and confusing.
v3.0.0 solutions welcome. Hurry up before they release 3.1!