Tides

I'm creating a world where the moon's planet has a more extreme elliptical orbit, where the moon gets really closer to the planet once per month and then goes further away. That's important for the world's lore, but I'm struggling to find sources showing how physically accurate this dynamic would affect the planet. I'm aware about the ocean tides, the effects on the coasts, but I'd like to have more information on this matter, or maybe should I be free to fill by myself those holes of information?