Contrary to popular belief, life in the Dark Ages was not as bad as it seems at first glance. In fact, the early Middle Ages were labeled "Dark Ages" thanks to an Italian theologian. Petrarch considered the time when the whole world renounces Latin as the beginning of the Fall, but the Italian simply had no other reasons. Those who were lucky enough to live in the Dark Ages could use some not so bad things like the first universities.
Education
It's no secret that education is the key to the progress and development of any society, and the Middle Ages were no exception. The classical education system from the early Middle Ages is still used in some universities, and at that time the very ability to receive centralized knowledge was just a gift from heaven.
Scientific progress
The foundation for the Renaissance was also laid in the early Middle Ages. Although much of Europe was cut off from Greek scientific texts due to the language barrier, some scholars have made significant contributions to the study of natural sciences. Italy, Spain and Gaul became the strongholds of the future leap in progress.
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Revival of art
It was a brief but eventful period of advances in the arts, literature and classical music. At the end of the eighth and ninth centuries, the Carolingians began a real revival of the Roman Empire: Charlemagne allowed the use of not only vulgar Latin, but also local dialects in writing, which significantly increased the general education of the population.
Nice weather
The Dark Ages, oddly enough, were a blessed time of excellent weather. The increase in temperature of the currents in the North Atlantic melted the ice, which allowed the Vikings to colonize Greenland.
Legal system
In the early Middle Ages, there was a very complex and fairly fair system of laws. Traveling merchants received the so-called Lex Mercatoria code of rules governing economic relations in all European countries. Anglo-Saxon law was also adopted over a large area, which allowed even the common man to feel relatively protected by state bodies.