The process of fixing nail holes starts with sanding the surface around the holes. Sanding gets rid of any traces of the nail hole and ensures a smooth filling. Using a putty knife and the appropriate filling compound, spread about a coins worth of putty into the nail hole. Smooth out the surface with the edge of the putty knife. Do one more coat of the filling compound and sand the area smooth. After letting the area dry and ensuring it is smooth with a sander, paint with desired color. That is how you fix nail holes.
Read more: The Right Way to Fill Nail Holes