Since 1879, Gothenburg has had tram traffic. From the very beginning they were actually drawn by horse, it wasn't until the beginning of the 20th century that the trams got electricity.
The City of Gothenburg owns and operates Gothenburg's trams. There are a lot of lines to choose from, the 3rd, the 5th, the 9th, etc. At each stop you will find a map of the city and where the lines go. Study it and if you are not sure just ask the conductor where to go or get off.
Just be careful when crossing the streets, because the trams whiz by at a good speed!
Every summer you can also see old trams going around the city. They are dusted off and polished every year, the oldest carriage is from 1902.
You can easily buy the ticket in Västtrafiks "To Go" App.