In Civilization 6, you can refer to the following for what is the victory strategy for domination and victory in Civilization 6:
The way to achieve domination victory is to capture the original capital of all civilizations. If you lose your original capital but still retain other cities, you can still gain other victories through culture, technology, points, or religion. But your chance at domination victory only comes when you take back your original capital.
The main goal of Domination Victory: capture the original capital of another civilization. It is recommended to start researching animal husbandry and grab horse resources first, and then research light cavalry (other civilizations may not have city walls at this time. Use light cavalry to steal the capitals of other civilizations quickly)!
In the Middle Ages, it was recommended to use siege units (siege towers, siege engines, trebuchets, catapults) and add combat units to the siege. Basically five to eight rounds are enough. In modern times, bombers and nuclear bombs can be used to siege cities.