If you meet with your friends, you say them "Привет!" ("privet!"). Also this word is used with respect to one's parents. In case of greeting unfamiliar people or elder people, in Russia we use the word "Здравствуйте!" (pronounced as "zdrastvuitje", it means "I wish you good health"); this greeting may be reduced to "zdrastje", if you meet someone, who elder than you or of equal age, but you meet with him (her) often and know each other well. Also we have male unofficial greeting "Здорово!" (accent falls on the second "o", "zdarova!"); Russian men use it with respect to each other (not to women!).

(как сказать, It means how do you say)(здравствуйте)Is the most respectful and formal way of saying Hello in Russian use this phase with people you don't know Also it shows that you have full respectful for then.But you can also use (привет)which is an informal way of saying Hello,You use this form with people like your friend and family that you know very well.

Привет! Здорóво! ( only with very good friends) Добрый день (formal greeting) Доброе утро Добрый вечер Здравствуйте ( 1. For people, who are older then you, 2) For a group of people (in this case the greeting is in plural). Рад/ рада вас видеть" (verbatim - I am happy to see you) Good luck))

Привет Здравствуйте Добрый день

Привет, приветик, здравствуй, здравствуйте, здорова - depends on type relationship and mood.