It is not easy to know in which country and in which city to study? You start collecting information from all over. You ask people you know how their stay in a particular city went. And you realize that the reasons why a city is appreciated or not are very variable, depending on the people who tell you about it. This is a good exercise in critical thinking to solve your current problem: where to study next year?
You have found information about universities on the site "QS Top Universities", which seems to be quite renowned. This site proposes, every year, a world ranking of the universities.