How does water affect the coastal climate?

Coastal climates mostly have to do with ocean currents, Imagine ocean currents like a river. Its contently moving around. In areas like Antarctica it transports the cold water which also carries cold air to the places where its current reaches. And in hot places like Florida it transports the hot water as well as the hot air around. This is why places around the equators ocean line is hot because it transports the hot air around by the currents. Please thanks if this helps!