The answers to this can be as different as the practitioners. Because there’s no strict system you must follow, there are really no rules. It’s a philosophical approach, a point of view, Chaos Magic is a way of defining reality, it defines all of reality as illusion.
Chaos Magic is rooted in the hermetic principle of Polarity:
Applying this idea, Chaos magic holds that if everything is real, nothing is real must also be true. Everything that society holds as real, the chaos magician holds as an illusion. He thinks of everyday reality as malleable, able to be changed, transmuted and shaped to the Will of the magician.