In an educational institution, educators create a stimulating internal and external material-spatial environment and organize the entire educational work. The educator organizes a stimulating environment to satisfy all children's needs and to encourage children's social, emotional, cognitive and motor development as well as the development of communication and speech. The educator in the environment nurtures the children's interests and abilities and at all times encourages and supports the child in various organized activities and free play. The room in a preschool is organized and divided into activity centers that the educator arranges, changes, adapts, and most importantly ensures a sufficient number of diverse stimulating materials and resources that can enable children's exploration and play. Materials and resources in activity centers should be safe, open, multifunctional, diverse, age-appropriate, aesthetically acceptable, easily accessible and interesting for children to encourage them to explore and keep their attention span as long as possible. The activity centers are arranged in the room depending on the conditions that each center requires, such as the separation of loud and quiet centers, the proximity of the sanitary facilities and the proximity of windows for natural light. This paper explains and describes in detail why is preschool a learning community and what is the importance of children's learning in an educational institution. The paper shows how the room in preschool and the choice of materials differ in traditional and modern educational approaches, what the internal environment of an educational institution looks like, how the activity centers should be arranged and what each activity center should contain. The paper also shows the importance of the external environment, what it can offer to children, how it affects them and what role the educator has in the external environment. An example of the floor plan of a room in a preschool and what it contains is also shown. The paper also explains the importance of educators in fostering togetherness, independence, research, creating a group culture, and ensuring the well-being of preschool children in educational institutions.