There are teachers' aides who help the teachers and let them spend more of their time in direct instruction. Some schools have library aides, some have cafeteria aides. In some schools, there are clerical aides, playground aides, or even bus aides. If there's an important job in the school that really needs some help, aides help. For example, in some schools it is tremendously important to have security personnel who help reduce the costs of vandalism, remove any threat of violence, or simply ease the occasional anxiety of a young child walking to school.
School nurses teach and heal in many ways.
And, of course, there's the principal who tries to help all of these people work together, so your children get a better education. By mentioning these people, we're sure we've left out others who deserve to be cited. But it is the whole school staff family that supports learning and makes it possible for your child to get a good education.