Did you ever see interstellar? [This](https://www.youtube.com/watch?v=4Hf_XkgE1d0) scene in particular. In this scene the black hole near the planet is pulling all the water up towards in giant swells of water, which leaves only a little water between the swells.
Same thing is happening on earth. The moon pulls, the water rises towards it. So the water is basically going into big swells that move back and forth. Luckily the moon is a lot smaller so its gravity is much weaker, and we dont have to deal with that nightmare fuel.
There’s a lot more to it, and this is very over simplified, but that should get you started anyway.
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