Learning to prepare assets for import into Horizon Worlds

Hi, 

I find the tutorial at https://developers.meta.com/horizon-worlds/learn/documentation/custom-model-import/creating-custom-models-for-horizon-worlds/creating-a-custom-model super useful, but I wish there were tons more of these.

I'm using AI 3D model generation to create modular 'parts' for my world, but then I have to texture it properly in, e.g., Substance Painter.  What is a good resource to learn how to do this?  Like I said, the tutorial linked to above is great, but it's not great quality and there needs to be many more like it.

Thank you very much!