congratulations
kon-gra-tu-la-TSYO-ni
Both 'congratulazioni' and 'auguri' work for congratulations. 'Complimenti!' is another option, meaning 'well done / congratulations'.
Congratulazioni per il tuo matrimonio!
Congratulations on your wedding!
Congratulazioni! Hai avuto il lavoro!
Congratulations! You got the job!