What states in Europe were created by the Normans?

In the Middle Ages in Europe, the northern peoples, who were called Normans, inspired great fear (however, there were also their other nicknames: Vikings, Varangians, Scandinavians, etc.). During the Middle Ages, they were also able to found states such as: Denmark, Iceland, Norway, Sweden, England.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.