Black holes occupy zero space but do have mass-initially, most of the mass used to be a star. When black holes consume nearby matter, they become “bigger” [technically, they are bigger]. The larger they are, the larger the “no return” area they have, and anything that enters their territory will inevitably be lost to the black hole. This point of no return is called the event range.
Ultimately, astronomers believe that by growing and consuming materials such as planets, stars, wrong spaceships and other black holes, astronomers believe they have evolved into supermassive black holes and found them in the center of most major galaxies.
But there is a twist. There are actually two twists.
First, black holes are older than the universe’s current age, because black holes begin to grow from dead stars to black holes the size of the Milky Way’s center. Therefore, astronomers also believe that the universe may have created a huge primordial black hole at the moment after the Big Bang, thus beginning the process, although this is only Weirdness and problems you might think of.
Second, there is little direct evidence that so-called medium-mass black holes are somewhere between black holes and the size of a galaxy. Astronomers expect to see some black holes at this intermediate stage It has become very large, but it is not there yet, and so far most of them have not.
There are indeed tiny and huge black holes. We still connect the dots between them.