Bow your head ever so slightly while shaking hands with someone as it is considered polite.

Never touch a person’s head as that part of the body is considered holy.

Do not point at anything using the foot as it is believed to be the most impure part of the body.

Tipping is usually not required as restaurants collect as GST or a service tax for their service.

Singapore is a mixed bag of cultures and thus, follows mixed customs. Be sure to do your research before visiting.