Hello good people!
Here a little experiment about the shader graph of the Unity 2020 HDRP pipeline.
I tried to make a fantasy and creative environment, thinking about the main plants in a modular way. I added some free assets from the Unity asset store as secondary details. For the grass i couldn't paint the billboard directly as grass in to the terrain. So i needed to make custom billboard shader in the shader graph. Then i could paint my grass as tree in to the Unity terrain.