Look-out, Rule 5
This rule is simple: stay on the lookout for other vessels and other risks in general to avoid collision.
Sailing vessels with the wind on different sides (starboard / port), Rule 12(a)(i)
The boat sailing portside (wind is coming from the port side, so the boom is on the starboard side) must give way to the boat on a starboard tack.
Sailing vessels with the wind on same side (leeward / windward), Rule 12(a)(ii)
If you are on the same tack, then the windward boat (the boat that is upwind) is the give-way vessel, while the leeward boat is the stand-on boat.
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