Children learn by what teachers only. The vast majority of teachers will teach in the theory or the contents, but the chance that a child will be implemented, or that there is very little actual use.
Children will learn what the teacher only. Most teachers are also taught about the theory or the content, but the chance that the child will be treated or the fact that there are very few.
Children will learn what the teacher only. Most teachers will teach the theory or content but the probability that the child will be treated or actually use it is very low.