Neo-Piagetian theories of cognitive development is a way to understand how kids think and learn new things. It's based on the work of a scientist called Jean Piaget who said that children learn and develop in different stages. Neo-Piagetian theories suggest that children can learn better if their activities and learning experiences are tailored to their stage of development. So, for example, if a 5 year old is learning about animals, it wouldn't be helpful to only show them pictures of adult animals. Instead, activities like matching baby animals to their parents or putting together a puzzle with animals of different sizes would be more appropriate. It's all about choosing activities that will help kids learn and develop at their own pace.