I-485 interview preparation

Hi, does anyone know what I need to prepare for my I-485 interview. Not there yet, but just wanted to get some others' experience.
My I-140 was filed as NIW.

to leta.taylor568:

I heard that the officer would go through the questions on Form I-485 and check the petitioner’s supporting documents. I would say just make sure you remember what you put down on Form I-485 and you have all supporting documents ready.

to bluebear361:

I did my interview and the officer just asked maybe three questions, about my employment, my current visa status and my plan for future employment in US. That's it.