What does near sided and far sided?

The Moon is "tidally locked" to the Earth; this means that the forces of the tides have slowed the Moon's rotation so that the Moon spins once per orbit, and the same face of the Moon is always turned to the Earth.

So the phrase "near side" refers to the visible side of the Moon, while the "far side" is the side of the Moon that we never see. It is incorrect to refer to the "dark side of the Moon" as meaning the far side, since the Moon spins once per orbit, meaning that a "day" on the Moon is about 14 days long - and so are the nights.