how work a black hole in the space

a black hole is literally a hole, imagine a totally straight road but on that road there is a hole (the black hole) so it is difficult to get out of there because from where the inclination begins to the hole on the road is very inclined so if you were to go down climbing there will be a point of no return because you will slip and fall into the hole and you will not be able to get out .. what I just said is an example now in space imagine a two-dimensional space that is a totally straight line until there is a U-shaped hole and then more line, then if you saw that from above it would be a circle then in a third dimension that would be a sphere, because that is what circles are like in the 3 dimension, then the point of no return is the "event horizon" where matter falls into the hole and not even the light can get out, which is the fastest in the universe, that is why black holes are black because the light can not get out so a black hole is a high-density matter that creates a hole, imagine a Blanket spread out with nothing solid underneath then you put a marble but made of a dense material, dense = heavy then the blanket will sink due to the weight then if more things fall inside the denser it will become and the hole will become bigger and deeper