Yes. Several quasars have been discovered; they are black holes, and they are quite active.
Black Holes' can 'eat' any type of matter in the Universe.
no
No
no
No.
At any time.
There is no proven connection between the Bermuda Triangle and black holes.
It isn't known whether micro black holes - usually called primordial black holes - exist at all. If they do exist, they can be at any random location of space.
Not really "a" black hole - many black holes. It is currently believed that all, or most, galaxies have a huge black hole at its center. Any galaxy should also have lots of smaller black holes - so-called "stellar" black holes, because they have approximately the mass of a star (larger stars can become black holes).
There is enough evidence for black holes - I don't see any problem there.
Yes, black holes are invisible to the human eye because they do not emit any light.
there is a black hole at the center of the universe