Inside black holes, there is a region where even light cannot escape. This region is called the event horizon of a black hole. We know nothing about everything beyond the event horizon.
Scientists believe that inside black holes there may be a zero mass point, a state where objects have a mass close to zero. They also believe that inside black holes there could be black hole singularity, a state in which the concepts of time and space change.
To fully understand what happens inside black holes, we need to look beyond the event horizon of black holes. However, this is currently impossible.
However, scientists are trying to develop new methods to understand what happens inside black holes. For example, some scientists are trying to predict what happens inside black holes by studying the light around them.
Understanding what happens inside black holes will help us better understand the universe. It will also help us understand how black holes affected the formation and evolution of the universe.