As parents, we always hope that our children can grow up healthily and become a good person; as teachers, we always hope that our students will become better than before. Habit is a trait with strong mental energy. Good habits developed in childhood will benefit a lifetime. So, what good habits do you think should be a good person? From a practical point of view, how should we develop these good habits? Is there a “critical period” in developing these good habits for children?