CIAO;means "Hello" and "bye". Yes, in Italian we use it for both.
Sì - NO;"Yes" - "no". Easy peasy.
PER FAVORE - GRAZIE - PREGO;"Please" - "thanks" - "you're welcome". Even if you don't speak a language very well, knowing a few polite words and phrases will make native speakers appreciate the effort you've made to acknowledge them in Italian.
SCUSA;"Sorry", "excuse me". For the sake of good manners, it's good to know.
IO SONO;"I am". You can apply it to a range of topics, not only your name but your job, nationality and many other things.
COME TI CHIAMI?;"What's your name?". After you've introduced yourself, you'll probably want to know how to ask for an introduction in return.
PIACERE;"Nice to meet you", literally "(It's a) pleasure". It's polite to express joy at meeting new people.
DI DOVE SEI?;"Where are you from?"
COME VA?;"How are you?". In Italy it isn't just a generic greeting, but a way to show interest in someone's well being.
BENE;"Well". A quick, go-to response if someone asks how you're doing.
NON CAPISCO;"I don't understand".
PUOI RIPETERE?;"Can you repeat?". If you have trouble understanding what a native speaker is saying, don't panic – just ask to repeat.
MI PIACE - NON MI PIACE;"I like" - "I don't like".
DOV'È?;"Where is it?".
POSSO AVERE?;"Can I have?". A handy phrase to know for ordering in a restaurant, bar…
QUANTO COSTA?;"How much is that?". It's useful to check prices before buying something. This will ensure you don't overspend.
PERCHÉ;"Why", "because". In Italian, it is used for both.