Stickers can be distributed in open classes. You can also send some small items such as stationery. Teachers reward stickers to show that children do better, such as actively answering questions in class, doing homework well, eating fast, keeping meals on the table and sitting better. These teachers will praise their children with red and green stickers. People need encouragement and praise. Teachers use these colorful stickers to encourage children, which is more conducive to their growth.