Black holes are a remarkable consequence of gravitation described by Einstein classical theory. At present, black holes become relevant in quantum gravity research. We are interested in understanding both classical and quantum issues of black holes and their relation to cosmological problems. Also, low-dimensional gravitation is a subject of our research, especially because of AdS/CFT correspondence. In particular, we study 2+1 black holes in AdS space with negative cosmological constant and also considering electric charge and rotation ( , , ,  )