I have a few comments with respect to this post, that is quite un-precise to my taste (even for a general audience).
According to the theory of simple relativity, mass causes curvature in space and time.
There is no theory of ‘simple relativity’. You probably mean ‘general relativity’ here. Please consider fixing your text.
If the mass of a body is compacted and merged into a sphere with a radius of critical value, it becomes a black hole
I am not sure to understand what this means? A black hole is not a sphere.
On the other hand, I don’t get much what you mean with the discussion on quantum black holes. Note that tiny black holes can actually exist. There are fine prints in the corresponding concepts so that we may evade some of the constraints.
Finally, what does the following mean?
The correct concept and theory has not been revealed so far.
General relativity is well known…