Rosh Hashanah is the Jewish New Year and is called the Feast of Trumpets.
The blowing of the shofar is a call to repent.
The common greeting is Shanah Tovah.
Shanah Tova is shortened from L'Shanah Tovah Tikatevu, meaning 'May you be may you be inscribed in the Book of Life for a good year.'
Have a good year.
A good blessed year.