Adventures are made up of interconnected Areas. To progress through the adventure the heroes move through one Area to the next and sometimes even need to go back to previous Areas. Sometimes the heroes need to do something in an Area before they can proceed to another Area, while sometimes they don't.
Heroes are free to move to whatever location they would like so long as they are able to do so.
All Areas have a description that must be given by the GM when the heroes first enter them. Areas might also have things the heroes can examine more closely with descriptions of their own, and they might contain people to talk to or objects to interact with.
When a hero arrives in an Area they place their hero token in it on the map.