Okay kiddo, so in Orthodox Judaism, there are certain beliefs and teachings that are considered very important. These beliefs and teachings come from the Torah, which is like the holy book of Judaism.
Sometimes, people might say or teach things that go against what the Torah teaches. This is called heresy.
For example, let's say there is someone who claims that there is more than one God. This goes against what the Torah teaches, which is that there is only one God.
In Orthodox Judaism, heresy is taken very seriously because it can be harmful to the community. It can lead people astray from the true teachings of Judaism and cause confusion and division.
So, when someone is accused of heresy, they are usually talked to by rabbis and leaders in the community. They may be asked to explain their beliefs and why they think they are right. If it becomes clear that their beliefs are heretical, they may be asked to stop teaching or sharing those beliefs with others.
Overall, heresy is something that is not tolerated in Orthodox Judaism because it goes against the core beliefs and teachings of the religion.