The "hello" you use depends on the area you live in here. So here's a few: "Hallo." - standard German, can be used anywhere "Guten Tag." - also standard German (more like textbook German, really), can also be used anywhere as long as it's not morning or evening "Moin./Moin moin." - northern Germany (and despite it meaning "morning" you can use it throughout the day!) "Servus." - southern Germany, mostly Bavaria (some actually take it literally and translate the actual Latin word into German and day "Diener." instead; pretty informal though) "Hi." - like the English "Hi"; in German this might be followed by your opposite asking "Wo?" (where?) because "Hai" in German means "shark"