Often, they relate to either the units produced there, or the buildings themselves. Research in the game is varied and is carried out not on the global technology map, but locally, in certain buildings.
Resources in the game 4 - food, which is spent on most units wood for most buildings stone for more advanced and durable buildings and gold, which is used extensively for both recruitment and research. The key aspects of the game are the economic component (quite simple, but effective) and military affairs. It is proposed to start with a modest settlement with three workers and one scout. The events unfold in the Middle Ages, roughly starting in the era of the fall of the Roman Empire and up to the Renaissance. In the game, the player has to take control of a small settlement of a certain faction and lead it to victory and prosperity.
Many years later, this game is still unique and serves as a role model for many strategy developers.
Age of empires 2 - is a re-release of the classic real-time strategy game with many different improvements.