I was looking at this post and I totally understand except the answer said that the series resistance at the output of the op amp is creating a pole and a zero. I am thinking pole is something that would attenuate the gain at 20dB/dec and zero is something increasing the gain by 20dB/dec. But here I cannot see that there is a zero being created. Shouldn't adding a capacitance always add a pole?
Also, doesn't zero means there is some frequency at which the output = 0? I am always confused of shouldn't this be a negative infinity in the gain of the bode plot since log(0) = -infinite?