Nin hao, hola, namaste, ahlen, ola, nomaskaar, zdravstvuite, konnichi wa, guten tag. They all mean one thing: hello.
There are hundreds of other ways to greet a person. Even if you try not to, you are going to learn something by going abroad, and that is most likely why you went. The best way to start is very simple: learn to say hello in the native language. Then learn to say goodbye, thank you and please. Challenge yourself to learn a different word or phrase every day.
give it the ol’ college try
It may be frustrating at first, but showing effort and trying to assimilate will show your hosts that you are trying your best to learn something. The people of that country will be much more willing to help you in return. Your hosts may help you out and speak English with you, but never assume that they will know English. Most people in the world (91%) do not speak English. Sometimes people of other countries like to practice their English. We should be just as eager to practice our foreign language skills with them.