With the popularity of DAZ Studio their documentation is severely lacking. I am no expert, not even a beginner, I only installed and started using Daz Studio at the start of September. I am finding that a lot of things are simply not intuitive. DS seems overly bloated, as if there has never been a rebase of the code, just keep adding more and more. It is also one of the slowest applications I have ever used.
I am learning parts as I find a need for them, right now I am trying to get a handle on lighting, or more precisely how to use an existing prop, that isn't a light, as a light source.