Hereare some polite ways to say hello in Japanese. こんにちは( konnichiwa )- Hello. / Good afternoon. Everyone has heard the word こんにちは ( konnichiwa ). It's a standard and polite Japanese greeting, but it isn't one that can be used around the clock. We'll talk more about greetings and the time of day later.
Heres a video demonstrating how to bow in Japan: Bow with your arms at the side, eyes facing the same direction as your head. Make sure to bow from the waist. Bowing with just your head or shoulders is very casual and can be seen as rude. Here's a great infographic on how to bow and how not to bow in Japan.