Question

What is at the bottom of the black hole..??​

Answer 1

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Answer 2

If you use Einstein's theories to determine what occurs at the bottom of a black hole, you'll calculate a spot that is infinitely dense and infinitely small: a hypothetical concept called a singularity. But infinities aren't typically found in nature.