First of all, the good things are that you can learn better the language that you want to study, so you will can comunicate with people all over the world. The other reason is that you can make new friends and meet new people. Finally, you can live on your own in a flat or in a residence. You can start to try to live without your parents and grow up because of you have to clean your room, make our lunch and dinner, wash your clothes and dishes.
To sum up, I think that studying abroad has its good and bad things, but I would like to study abroad because of the level and 'cause I can learn more languages than in my country.