Salut: hi and good-bye (informal)
Bonjour: hello or good day (formal / informal)
Au revoir: good-bye (formal / informal)
À bientôt: see you later (informal)
Bonsoir: good evening (formal / informal)
Bonne nuit: good night (formal / informal)
Comment ça va? :How are you? (informal)
Ça va? : How are you? (very informal)
Comment allez-vous? : How are you? (very formal)
Bien, merci. : Fine, thank you.(both formal and informal)
Super! :Great! (very informal)
Ça va bien. : I am well. I am fine. (informal)
Ça va bien, merci : I am well, thank you. (formal)
Ça va mal : Not very well.(both formal and informal)