Consider that the frequently used accented letters are the followings: à è é ì ò ù as you may see, only /e/ has two possible accents; all in all : unless you are a professional speaker (movie, theater, TV news, etc.) the important thing to pay attention to is WHERE the accent goes (on which vowel); the kind of accent is usually ignored by many Italians that went through High school and also University education; This is my suggestion. I teach and never worry about this fact, nevertheless my students (in their twenties) understand me clearly. Sorry I did not explain you anything related to the real subject. Here is a reference, with just a little information: www.italianlanguageguide.com/italian/pronunciation/stress-accent-marks.asp

Cambiare l'accento può cambiare il significato della parola.Ad esempio:retìna=piccola rete usata per trattenere i capelli - rètina=membrana dell'occhio

Gli accenti possono essere gravi o acuti. La loro inclinazione modifica il modo in cui la parola è pronunciata (in modo più o meno acuto). Quindi sì, la loro inclinazione è importante!