Still waiting for someone who can explain the tides, flat earth or globe.
The earth is under the gravitational influence of both the moon and the sun. The rocky parts of the earth are solid and are not affected. However as water can be moved freely, the sun and moon can have an influence. Both will only move water by a small amount, which is why you can not really see this in a large lake or puddle. However in a large connected body of water, i.e. our oceans, the cumulative effect is quite pronounced.
Rather than being like the view you have as a kid where when the tide goes out it is going in on the other side of the sea, oceans around the world are sqeezed and pulled together. For example, the next high tide in Sunderland is 3:13am, with Esjberg in Denmark (roughly due East) reporting 1 minute later. Cape Town has a high tide at 3:52am despite being in the southern hemisphere. However on the opposite side of the world, Tokyo has a low tide at 3:36am. Sydney is further west and has its low tide a few hours different to Japan.
Around the same time, the moon will be high in the sky above the UK with the sun 3 hours from rising. Our side of the earth is pointing at the moon and the sun is starting to have an effect on our side. This gravitational pull is pulling the water more water towards our side than the opposite side. The closeness of the sun and the moon affects how high the tides are, which is why some are higher than others. Also because the planet is on a tilt, some points of the year, we are that bit closer to the sun it has a higher influence.
It is a bit like scattering iron filings on a table and waving a magnet high above them. There might not be the pull to suck them right off the table but you can see a wave as they stand on end.
Tides could work on a flat earth. I don’t know their explanation, but if you picture the world like a clock face and you have two invisible hands under the surface opposite each other, one pushes water up while the other sucks it down. The peak of the tide would move round in a wave following the pointer. That sort of works, but has a couple flaws. They don’t believe in magic invisible forces that has an attractive pull on objects like gravity and magnetism, and secondly they believe that water always lies perfectly flat and that is why the earth is flat, so can not add a theory showing it does not. It also can not explain higher spring tides.
It is a shame, because if you made a flat model of the earth, then made it 3d by adding terrain and moving tides, it would be quite pleasing and clock like to watch.