It's kinda like, if you want to be a guitarist, you may want to know a little bit about strings.
That may not have made any sense. Let me try again. It's easy to misunderstand when you don't know something completely. It isn't possible to know children completely either (and like, who wants to that will make for very long days XD) but the idea here is that the more you understand the better off you are. For example, psychologist Efik Erikson had a theory that the early years of a child, ages 2-3 or around there, are when the child is going through a stage of learning to make choices. This is when they'll experiment with their surrounding and bodies and won't be afraid to do so. The theory is that they do this because they are supported and don't feel ashamed. If the child feels ashamed or is ridiculed, they can start to think of themselves as stupid and this will effect their self esteem later on.
While this theory and others have had some scientific proof, the fundamentals are valid in that children who are ridiculed for trying certain things, are more prone to not try them. Knowing this can help you in what you allow the child to do, and also effect what role you will play in their decision making stage.
There's tons of theories and claims that can be studied up on. The more you know your area of study, the better you'll do in that area.
I hope this helps. If you have any other questions or if I can assist you with something else, please let me know.
Take care Ice Queen.
Content will be erased after question is completed.