Alright kiddo, dina d'malkhuta dina is a special rule that means "the law of the land is the law."
Basically, it means that if you live in a certain place, like a country or a state, you have to follow the rules of that place. Even if you don't like the rules, you still have to follow them because it's the law.
For example, if you live in a place where it's against the law to litter, you can't just throw your garbage on the ground because you don't like the rule. The law is the law and you have to follow it, or else you could get into trouble.
Some people believe that this rule comes from the Bible, but it's also used in many legal systems around the world. It's a way to make sure everyone follows the rules and that there's fairness and order in society.