Aft means rear or stern, while the bow is the front of the ship. These are always valuable things to know at sea. Tender isn't how you want your steak, but rather the vessel that takes passengers to and from shore when the ship is at anchor in a port. Some ships have open bridge policies which means passengers are welcome to visit at any time. On the other hand the Brig isn't a place you want to be, as this is the ship's jail.
Some passengers tend to leave all etiquette behind when it comes to waiting in line.
There are times when you will have to be patient and wait your turn. Please do it with grace. This means not crowding the stairways when it's time to disembark either in a port or on the last day and in disregard of the pleading crew members who beg you not to do this. This can get pretty awkward, especially when eight or ten strangers are seated at a dinner table. The proper etiquette, when everyone imbibes, is to take turns buying the wine.