Everyone always have many teachers in their life. It is not only the teachers in the class, but it is including classmate, friends in the work, neighbor, boss, and especially our parents. Parents are the first teachers in our lives, and they always give many advices for us.
Our beginning of parents to teach us while we was born and taught us, they shared experiences in their lives to us. On the other hand they teach us also language and other knowledge.
So, our parents are the best teacher in our life.