I am trying randomize the z location of each point distributed on a plane. Since 3.0, you cannot use the Attribute Randomize node. I tried using Random Value + Combine XYZ into the transform translation node but that didn't work.
The Transform node is for moving geometries as a whole, not one by one, and doesn't accept field inputs (diamond-shaped socket), only singular values (circular socket). You can use the Translate Instances node and feed it with a Random Value > Combine XYZ—Z setup instead:
Or a Random Value in Vector mode, of course: