What causes ocean tides?

You ask: What make tide?

Moon up in sky pull on everything, even the big water — Caveman cannot feel it, but ocean can. Moon tug the water on Caveman side of Earth, lifting it into a bulge toward moon. Strange part: water on the far side bulge too! That because moon pull the solid Earth harder than it pull the far water, so the far water get left behind, bulging out. Two bulges. Earth spin round each day, carrying every shore through both bulges — so tide rise high two times and fall low two times. Sun pull too, but its tug on the tide only about half as strong as moon's. When sun and moon line up, the tide swing biggest. Cave wisdom: tide not water breathing — it two bulges the moon make, and the shore spinning through them.