Formal:
* Здравствуйте! (Zdravstvuyte!) - This is the most common and polite greeting, used for anyone you don't know well or are showing respect to.
* Добрый день! (Dobryy denʹ!) - Means "good day" and is used during the day, similar to "good afternoon" in English.
* Добрый вечер! (Dobryy vecher!) - Means "good evening" and is used after lunchtime.
Informal:
* Привет! (Privet!) - A more casual greeting, used with friends, family, and people you know well.
* Здорово! (Zdorovʹo!) - A very informal greeting, used with close friends. It literally means "healthy!"
Other options:
* Рад вас видеть! (Rad vas videtʹ!) - This means "glad to see you" and is a more formal way of expressing greetings.
* Приветствую! (Privetstvuyu!) - This is a more formal greeting, meaning "greetings" or "I greet you."
The best greeting to use depends on the situation and your relationship with the person you are greeting.