They want to learn things for themselves.
If you tell your kid to do something, good luck. But if they’re allowed to be the one to choose, they love to cooperate and things go much smoother than if they weren't given any autonomy. As exhausting is this can be, it actually builds trust between you and your child. They begin to trust what you say without blindly obliging and they also trust that you'll be there to help them figure it out along the way.