Preferably you cut and fit a patch of drywall. I always do that for holes and gaps over 1/2 inch.
Drywall mud is the thick, goopy white stuff you use to fill the seams between boards.
Yes, we all do that.
There are a few ways that you can repair a large drywall section. One way is to use a patching compound and apply it over the area that needs to be repaired. Another way is to use a drywall adhesive to attach a piece of drywall over the area that needs to be repaired. Cut a piece of drywall to fit the hole. Attach the drywall to the studs with drywall screws. Cover the seams with drywall tape. Cover the entire patch with joint compound. Let the joint compound dry. Sand the joint compound. Paint the patch. For getting the professional drywall patch repair service contact us.
You use scrap pieces of drywall and joint compound.
PVA is not commonly used on drywall.
If by wall board you are referring to drywall (aka gyprock or plasterboard) then you use drywall mud and tape in the usual manner. If however you are referring to paneling, then it is a different matter.
No, you don't use drywall anchors if you can use a stud.
Wood, an possibly clay (or grass) to fill the gaps, possibly hides for insulation and/or waterproofing.
Regular drywall primer.
Yes, you can use Kilz over drywall. It is an undercoat, or primer.
Check the outline to see if there is a place for the new ideas
Drywall is the standard covering of the interior frame of many houses.