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The moon pulls the ocean on the near side of the earth more than it pulls on the center of the earth. The pull on the ocean at the far side of the earth is smaller still. This causes the near ocean to accelerate toward the moon most, the center of the earth less, and the far ocean still less.
Tides are caused by the gravitational pull of the moon and sun. The tide itself is actually a huge wave with an extremely long wavelength. The wavelength is so long that it is only easily observed in the ocean because of it's size. Tides do occur in lakes and ponds they just aren't noticible. Seas and Oceans have space which air can flow freely without stopped by any objects where as in lake or pond ,the water is less and not that much air flow freely. So the air makes large waves in seas and oceans than the lakes and ponds.