Most Italian words are stressed on the second syllable from the end, e.g. andare, parlare, tradimento.
If a polysyllable word is stressed on the last syllable, it is marked in writing with a graphic accent (a dash above the letter), e.g. sarà , gioventù.
Many words are stressed on the third syllable from the end, some rare grammatical forms even on the fourth syllable. This is not stated in writing.