'Age of Empires 4' Feudal Age Build Older Guide: How to Get into this Age Faster, What Landmarks Required for Every Civilization, and More
In order to progress from the Dark Age to the Feudal Age in Age of Empires IV, players must choose, and build, either one of the two Landmarks of the Civilaztion that they are controlling. Before this, they need to prepare the resources needed, including Food and Wood.
Source: gamenguide.com