Vancouver just like most metro area has a well structured public transportation. It covered bus, skytrain and water bus. So unlike Singapore which you have to buy separate tickets for MRT and bus, when you're using translink in Vancouver, you could use the same ticket to jump from skytrain to bus.
The first thing you need to figure out is whether you need the one zone or two zone tickets. If you're coming from airport, you'll need two zone ticket to get you downtown. But once you settle downtown and just getting around in the area then you'll just need one zone ticket for the most part. Look at the map below.