To add to yebellz splendid advice: The most annoying thing to do is pass before the game is over, especially when there are unclosed borders. In that case the game cannot be counted, so your opponent has to play on. So never do that.
Also (in spite of that not being the question): Resign when YOU are sure you have lost. Not when your opponent thinks you have lost. 
And yet another point: If the game is very close to counting (say just a few moves) I prefer to play to the end (no matter if winning or loosing). But that is just a personal preference.