Thank you for the responses and the pdf!
I am reading and mentating very slowly through the pdf since it has been many years since I took physics.
From my understanding so far of the pdf: The entropy of black holes are proportional to area. But under Generalized Second Law, the entropy of black holes and its surrounding should never decrease. We know that black holes can evaporate, meaning the area goes down to zero and so the black hole's entropy also goes down to zero. Therefore under GSL, the surrounding environment's entropy must increase. Zel'dovich predicted that rotating black holes cause amplification of certain waves, which means quanta are spontaneously emitted. But in actuality, neutrinos have not shown to be amplified due to Pauli's exclusion principle. So at present time, are we trying to figure out what exactly are emitted by black holes?
It seems that the more I read, the more questions I have.