Parents hold the most important part in a child's life. Children tend to imitate the behaviour of their parents to be more similar to them and that makes the parents the most important teachers in a child's life. With parents, educational professionals also have one of the most important roles in the process of child's education and upbringing. Through its program, pre-school prepares children for elementary school. They socialize, develop spacial navigation techniques, get basic hygienic habits and they become more and more independent. A research was conducted through an Internet browser in August 2019. on the total amount of 326 people, all of whom were elementary school professors in the Republic of Croatia. The goal of this research was to find out the differences and similarities in personal opinions and experiences of elementary school teachers regarding children that are enrolling in the first grade. Also, the goal was to see what are the basic bits of knowledge that the children should get and have before enrolling in elementary school.