1. Economy-The economy in the Middle Ages was mainly a feudal manor-style natural economy. Many commercial cities have emerged, forming a trade zone centered on the Mediterranean.
2. Cultural thought-The church has secular power, and its rule is very strict, which controls the culture and education in Western Europe. Priests can't get married, advocate abstinence, preach scholasticism such as trinity and original sin theory, strictly control the spread of scientific ideas, and set up inquisition to punish heresy. School education also serves theology.
3. Politics-feudal hierarchy is strict, and feudal lords of all sizes form a pyramid hierarchy, but their rights and obligations are limited. Establish a duke-Hou-Bo-Zi-Gong system, with the duke under the Pope and the king and knight as the lowest feudal lords.
4. Military-The wars in the Middle Ages were organized by loosely organized fighting groups, confronted and clashed with each other on the battlefield that needed strategy and mobilization, and then evolved step by step. Part of evolution is reflected in the development of different arms and weapons and how to use them. Characterized by knights and cold weapons.