Experience
Experience is the first thing that working abroad can give you. You can get all of the experience in the world by working out in it. You can learn new skills and learn how to do new things, and you can get better training programs for your jobs than you would be able to do if you weren't working abroad. You can benefit from the teachings of people who are from different countries and cultures than you, because they'll have different ways of teaching and different methods. All of this experience can benefit you later in your career, no matter what it is that you are doing.