Portland is well known for its public transportation, known here as TriMet. A combination of buses, the light rail (known as the MAX), and streetcars will get you pretty much anywhere you want to go. They make everything pretty simple, and the bus drivers are generally nice and willing to help you get where you’re going.
If you’re trying to use the public transportation here, a good place to start is on TriMet’s home page, where they have a handy trip planner that will help you figure out what you need to do.
The fares are simple. $2.50 will get you a 2-hour pass that you can use on any form of public transportation, as many times as you want, to go anywhere in the city. Day and week passes are also available.
Trimet also has a well made app available on Android and iOS where you can buy digital tickets that can be used on any of the transit.
And that’s pretty much all there is to it. It’s as simple as that.