[Zubersoft]

I'm not sure what you mean when you ask what kind of metadata you should use - this is entirely based on your own needs and desires for organizing your library. If you enable the option to extract PDF metadata, then yes, the metadata is read out of the PDF. Different tools can embed metadata into the PDF (using xmpDM for example). This has been discussed a bit in other threads:

https://www.zubersoft.com/mobilesheets/f...11118.html
https://www.zubersoft.com/mobilesheets/f...10309.html
https://www.zubersoft.com/mobilesheets/f...-8020.html

Mike