First thing I do before I travel to a new country is learn how to say hello and goodbye. This shows the people in your host country respect and helps open up the lines of communication. Here are a few greetings and farewells from across the world. (Links have pronunciations.)
There are hundreds and hundreds of languages and here are only a few. You’ll learn that while traveling often saying hello is much easier than saying goodbye. Hopefully this helps you on your adventure!