Preschoolers learn through doing. It's more effective for children to find out new things on their own rather than being told what the answer is. Adults should model new skills and then give children some space to practice them on their own through trial and error.
The messier the activity, the more fun preschoolers will have. Integrating sand, water, paint or other art supplies into an activity means that children will enjoy what they're learning.
Because young children have little control over their own lives, preschoolers can get nervous or agitated if they don't know what's coming next. In order to make children feel safe and comfortable, preschool teachers should stick to a daily routine. Post a picture of each activity in order somewhere where children can see so they can check the schedule if necessary.
Preschoolers are learning to control their bodies and have a hard time sitting still. Alternating between activities that call for children to sit at a table and activities that allow them to move around allows them to burn off some energy so they can concentrate.
Teachers and other adults working with preschoolers need to be both loving and firm. Children who are away from their parents for the first time need to feel comforted by preschool staff in order to be able to learn. At the same time, preschool teachers need to be firm enough to get attention and respect.