Don't panic, its much simpler than it looks, and it isn't crucial to memorize the names of the points, though it really adds to the aforementioned pirate-talk, and is used in sail coaching and discussions. Each of these points of sail show a possible wind angle. Even though the points of sail are relative to the boat and and not a specific compass direction, let's say the wind is blowing from the North, just to keep it simple. The rule of thumb: set the sail angle to half the wind angle.