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
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
men usually shake hands when meeting new people and friends. Women they sometimes kiss on the cheek