Scenarios: Abusing a black hole So a black hole is this large, sphere-blob shaped fluid thing that distorts space and time, making a weird hole in space(even after 5 years, I still don't exactly get what a black hole is exactly and where the mass goes when it eats xD). 

So, let's say, we make a huge antimatter(opposite charge, same mass as matter) star and send it into the black hole. What would happen? The antimatter would annihilate with the matter made black hole, or is it wrong to assume a black hole is made of matter?(I assume not much would happen if the antimatter can't react with the matter, because the black hole would probably get its original charge messed up.)

What about if we created a huge exotic matter(same charge, opposite mass) star and sent it into a black hole? Would the repulsive force successfully destroy a black hole? According to Kurzgesagt and several articles cited by them, exotic matter is able to keep a wormhole stable, so wouldn't it be able to annihilate the black hole or something? Or have I made a misunderstanding?
Black holes are not "made of matter". They are better described as structures of gravity/warped spacetime. However, they do grow when absorbing things with positive mass-energy. 

Antimatter still has positive mass-energy, so the black hole cheerfully gobbles it up. 

Now, exotic matter with negative energy density might indeed decrease the size of the black hole, akin to some form of enforced evporation process. (paper1, paper2) This is highly speculative since there are various theoretical reasons why exotic matter does not exist, and many kinds of hypothetical exotic matter that might work differently.