I tried to google it and it left me very confused.
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Sail boats have a keel underwater that prevents the boat from sliding sideways. The sail is shaped and adjusted such that a breeze coming directly from the side gives a bit of forward push along with the force that causes it to tip.
The keel also helps. Imagine a watermelon seed on the table. If you press on it with your finger, it’s shape causes it to slip out in a predictable way.
Although they can’t sail directly into the wind, they can move when the apparent wind direction. Is slightly forward. By zig-zagging, the boat can make slow progress toward the destination even if the wind is coming from exactly that place
(And yes bystanders, I do know all the proper nautical terms for this stuff)
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