This is a test of commonsense. Complete the next sentence:

How to use wall plugs and screws
Determine if you need to use wall plugs, or if you can hang an item on a stud.
Purchase or rent a stud finder and mark the locations on your walls. If those areas don't match up with the project, then move on to finding wall plugs and screws that will work.
Installation in the center of a stud is always preferred, because it is a load-bearing support. Walls, especially dry wall, are not designed to hold large, heavy objects by themselves.