Buongiorno (Good morning/Good day) (formal and informal greeting and leave-taking, used until 4-5pm)
Buona sera (Good evening) (formal and informal greeting and leave taking, used from 4-5pm until late at night.)
Buona notte (Good night) (formal and informal leave-taking, used late at night especially upon leaving or going to bed)
Per favore (Please) (same use as English) Grazie/Mille grazie (Thank you/Thank you very much) (same use as English)
Prego (You’re welcome) (Used in response to “Thank you.” Also used often to be generally polite. It might be used to give a stranger permission to pass on the street, or by a waiter after someone has ordered.)
Scusi (Excuse me) (formal, used to beg someone’s pardon or get someone’s attention)
Scusa(mi) (Excuse me) (informal, used to beg someone’s pardon or get someone’s attention)
Permesso (Excuse me) formal and informal, used to let someone pass or to ask someone if you can pass
Salute! (To health!) Said when someone sneezes, or when toasting drinks
Buon compleanno! (Happy Birthday!)
Buon Natale! (Merry Christmas!)
Buon viaggio! (Have a nice trip!)
Buon appetite! (Enjoy your meal!)