Yes, moon phase is global. To understand the phase, hold up a round object and do a slow spin and watch the light move across the surface. It works like that, with the Moon taking 28.5 days to go around the Earth and make a full cycle.
Tides are due to gravity from the Sun and Moon pulling on the oceans. There are a lot of complicating factors, but high tides will be when they’re both aligned at new or full moon.
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