Bushido Is a samurai code that expected warriors to be honest, fair, and fearless. The samurai code took a long time to develop, but much like the code of chivalry; contains many expectations that need to be followed. The word Bushido means "The way of the warrior." This code helps society because it teaches samurais how to become the best they can and do anything for their lord or Daimyo. Without Bushido Samurai wouldn't be trustworthy and people wouldn't have had good protection.
You might find information about Busido in Documentaries.
Feudalism is an economic and political system that developed in Europe. The feudal system ties classes together, each class helps each other and provides each other with necessities needed to live. For example samurais provided protection for peasants and in return peasants provided them with food and goods. Much like Europe there are higher classes and lower classes. Feudalism made it so society would stay together. It helped keep clear of who was in charge of who. Without feudalism society would not be as organized because people would think they can do what they want and not help any other of the social classes.
You could use the visual of a feudal pyramid.