In both Japanese and European feudal systems, what was the primary role of the peasant or serf class?

To farm the land and provide food and resources to the warrior class in exchange for protection.

What was the code of conduct for European knights called, and what was the code of conduct for Japanese samurai called?

European knights followed chivalry, while Japanese samurai followed bushido.

The lords were called daimyo, and they provided land to the samurai in exchange for their service.

European castles were typically made of stone and used to protect serfs, while Japanese castles were usually made of wood.

In Japan, it was the shogun, and in Europe, it was the king.

I can compare and contrast the social hierarchies of Japanese and European feudalism.

1
In both Japan and Europe's feudal systems, peasants/serfs were required to farm land and surrender most of the food they produced in exchange for protection from knights/samurai.
2
European knights followed a code of chivalry, while Japanese samurai followed a code of bushido, both of which demanded honor and loyalty to their lords.
3
Japanese feudalism was based on the ideas of Confucius, emphasizing community and moral duty, while European feudalism was influenced by Roman practices and legitimized by the Catholic Church.