So first of, sorry if this is a basic newbie question. I have only owned my home for less than a year and am trying to get handier as I go. I know the basic difference between drywall and blueboard and how to handle each when it comes to big jobs from when I assisted (using the term loosely as I mostly observed and stayed out of the way for the most part) in redoing our basement.
In the upstairs of our home the walls are in good shape, just looking to paint them. In this, we would like to repair some nail and screw holes. These are all fairly small and would not require any mesh or additional drywall or sheetrock. The issue is I dont know whats under the paint, mudded drywall, or plastered blueboard. Does it matter since I am just filling small holes and not adding material? I just want to make sure I'm not making any silly mistakes. Should I be using plaster to fill the hole (this one I am the most sure is not what I should be using), or should I be using joint compound or Spackle. Does it even matter? Again, I realize this may be a silly question, but I'd rather be safe then sorry.