One idea that's important in computer science is abstraction, Abstraction is a complicated word, but it just means separating out details that are not needed so you can concentrate on the things that are needed.
In this activity, we’ll organize a lunch box! Classify the food into two groups based on some kind of feature, like color, shape or food group. You don’t need to use all the food. With a friend, compare what kind of rules you came up with to classify the lunch.