Okay kiddo, so imagine there's a place called hell where people go when they die if they've been really, really bad according to the Christian religion. It's like a big, fiery pit with demons and stuff like that.
Some Christians believe that people in hell will be punished forever, while others believe that they'll eventually be released after their sins are paid for. Some Christians also believe in a place called purgatory where people go to be purified before they're allowed into heaven.
Overall, Christians believe that hell is a place to be avoided at all costs, and that the best way to do that is to live a good, moral life and follow the teachings of Jesus.