All roads in Amsterdam lead to the Dam, and all lead from it.

The Dam gives the city its name--Amstel dam, the dam which stops the river Amstel on its course to the Zuyder Zee.

It also gives English and American visitors opportunities for facetiousness which I tingle to recall.

Every tram sooner or later reaches the Dam: that is another simplifying piece of information.

The course of each tram may not be very easily acquired, but with a common destination like this you cannot be carried very far wrong.
One soon learns that the trams stop only at fixed points, and waits accordingly.