Chess players touch all their pieces before a game to confirm that they are all on the right squares before they play. This is important as moving a piece from the wrong square when you begin (such as a knight on a bishop’s space) can instantly disqualify you from the game. It’s part of the general etiquette of chess.
It is often considered rude to talk during a chess game unless you know your opponent well and they are OK with it. Apart from a few certain conditions within the game that require players to announce something to the opponent, they don’t usually talk during a chess game.
There are no rules in chess about where a player’s eyes should remain. Players may look away for many different reasons such as bluffing, thinking, taking a break, visualization and just personal habits.
You don’t have to say check in chess as it is not a rule. There can be good reasons, particularly in competitive play, not to declare check. However, in friendly games with nothing riding on the outcome, it’s considered good manners to say check when you place the opponent’s king in check.
In the majority of cases, chess players resign because one player believes that they are no longer able to win the game. However, many chess players, particularly beginners may resign far too early and while the option to resign is always open to you (whether you are winning or losing) you might want to think twice before you do so.