The most expensive coloured zone you pass through on your journey from A to B determines the fare you have to pay. You have to pay for minimum two zones.
Metro, bus and train can be combined as much as you like for as long as your ticket is valid. It will say on the back of your ticket. You can buy your ticket at the ticket office or in the machines inside the stations. If you take the bus, you can buy your ticket from the driver, but bring coins, not notes.
If you are going to be using the bus, train and Metro a lot, you might want to consider buying 10 trips at one time, a 24-hour-ticket or a Copenhagen Card
, which will give you free access to 60 major attractions and various discounts.
Flick through the maps above to get an overview of the transport system. Here you will find maps of transport zones in Copenhagen, North Sealand, the CityCirkel 11A bus and the habour bus.