Okay kiddo, so a Beth Din is a kind of court that follows Jewish laws and rules. It's like a group of people who are really good at knowing and studying Jewish laws and they help people solve problems and disagreements that have to do with these laws.
Let's say two people are arguing about something and they can't agree on what the right thing to do is. They can go to the Beth Din and explain their sides of the story. Then the people at the Beth Din listen carefully to both sides and use their knowledge of Jewish laws to come up with a fair decision.
The Beth Din can help with all kinds of things like business disputes or matters of family law. They are respected for their knowledge and wisdom when it comes to following Jewish laws and traditions. And even though it's a serious thing, going to the Beth Din can end up helping people make peace with each other and live according to their beliefs.