The correct answer to this open question is the following.
The best way to study international relations if your goal is to make sense of what happens in the interaction of various countries is to attend a very good school and to do different internships in different countries in order to live and understand the many different cultures around the world.
You can also apply for a part-time job in an embassy, so you could get familiar with the foreign issues and international relations terminology.
This is of the utmost importance if you want to be a successful diplomat. There is nothing like understanding the culture, customs, history, and traditions of other countries to set proper negotiations and reaching agreements that benefit both countries.
