In order to master Italian pronunciation, consider that if there are contiguous vowels in a word, we pronounce them with a
single voice emission (diphthong, a glide from one vowel to another and to a third in case of triphthong, like in "rain" or "loyal") or with
two voice emissions (hiatus, like in "liar").
Don't worry about it now however, you'll familiarize with vowels by paying attention to native speakers pronunciation
Some advice on mastering pronunciation:- listen carefully to the recording and repeat it out loud pretending that you are a native speaker of Italian;
- if you have difficulty in pronouncing a word try to relax as much as possible (particularly the facial muscles) and divide it into syllables: cameriere (waiter) will become ca-me-rie-re;
- make a list of words that give you pronunciation problems and practise them.