There are rules

There are rules to playing go
that are not written in any book.
Beginning the game you must bow slightly
and say 「おねがいします。」
and on finishing another slight bow
and say 「ありがとうございました。」
If you are playing with a handicap you place your
handicap stones in a certain order (I always forget the order).
If you are of the same rank you have to do a "nigiri" to
determine who gets the first move.
(everyone forgets how to do this)
After you both agree that the games is over
you must count your captured territory.
Arrange the areas in 5s and 10s so that it's easy to count.
I always do this wrong and the master comes over and fixes it.
After the game you put the stones back into the container.
This sounds simple but the stones are everywhere, black and white.
So sometimes if the opponent's stones are close to me I'll pick them
up and put it into the opponent's bowl since it's easy.
Most are okay with this and also do it automatically.
But some of the older players get offended when you do this
and say, in English, "Don't touch my stones." which surprised me.
I chalk this up to customs from the Showa Era. I saw one of these
men wearing a pocket watch on his belt like a scene from an old movie.
And finally, you should not gloat when you win, but I still do
and get frowned upon. Just a "Yes!" and a small punch at the air.

It's a society of rules I've come to learn.