Please teach me what is "learning gap"

Usually, learning disabilities cause learning gaps. For example, your child has a dyslexia. He'll have a difficulty trying to learn to read and causes the what we call, "learning gap". Another example, if the family of the child has not enough resources like financial needs, and other basic needs, it can cause a learning gap. They might be left behind at school because of these factors that cause them to have a learning gap.