I am looking for a confirmation (or correction) of my thinking about the nature of the black holes. As I am not a physicist and only a physics enthusiast, my understanding is probably very simplified so please forgive me - it is not ignorance, just me trying to comprehend some of the mysteries of the universe.
When I try to imagine what a black hole really is, I find that the name "black hole" is actually very confusing. What I understand from what I have read is that, of course a black hole is not any hole after all i.e. it is not a portal to other universe (as sometimes shown in sci-fi movies) or any other kind of hole in the spacetime of our universe. I imagine that a black hole is just a very massive object, more massive and more dense that a neutron star. So massive that it does not let any light leave its area of gravitation - therefore we perceive it as a black hole - black point on a sky - with its borders being the event horizon - the point beyond which nothing can ever go back (as the speed necessary to do that would be higher than the speed of light ergo impossible). Therefore, calling it a black hole is a simplification.
To put it in a simple perspective - there might be a black, rubber ball on my carpet that my cat is playing with - it is black, so it does not reflect light. When I look at my room there is this one, oval point where there is nothing - no light coming from - but I know it is not a hole in spacetime, it just does not emit any light so I do not see it, but it is still there.
Of course, in case of a black hole, there is also a matter of gravity - which can by spotted - but this is simply a result of that whatever is inside a black hole is much more denser and heavier than my cat's toy. One way or another, not emitting any light (due to being black and just absorbing light or being so massive that the light cannot escape) is not an evidence of not existing/being a hole in space etc.
Is my understanding, in these simple perspective, any right?