don’t stand too close to people, even friends. No closer than the distance from your elbow to the tip of your thumb is a good rule of thumb (good pun, eh?!)
men do not hold hands with each other and this can make people believe you are gay
when sitting next to someone on public transport, it is awkward to touch any part of their body with any part of your body so try not to, even your leg against their leg
we don’t kiss people when we first meet them and often don’t, even when we know them well
men usually shake hands when meeting new people and friends. Women sometimes do, but not always, but they sometimes kiss on the cheek (only one side and only once).