One of the main effects of the Magna Carta was to put a rein on the king's power, making sure he didn't become too dictatorial. It's kind of like putting a speed limit on a highway - it keeps everyone safe and makes sure no one gets too carried away. But, how did it actually work, and what were the consequences for the king if he didn't follow the rules?
The Magna Carta established the idea of rule of law, which means that everyone, including the king, has to follow the same rules. It's like a game where everyone has to play by the same rules, and if you break them, you get penalized. This was a pretty revolutionary idea at the time, and it paved the way for modern democracy.