Forma impersonale

In Italian language, there are different cases of verbs or phrases that can be used impersonally. The impersonal verbs do not have a determined subject and are mainly used in the third person singular. Verbs are made impersonal by using the pronoun si followed by the third-person singular form of the verb. All verbs can have this construction, where the subject is implied because it cannot be identified with a specific person or thing. This way of expressing impersonal statements is comparable to English sentences preceded by the subjects ‘one’, ‘they’ or ‘people’.
Si mangia bene in quel ristorante - One eats well in that restaurant

If the sentence contains a singular direct object si is normally followed by the third-person singular form of the verb, but the third person plural form of the verb is required if the sentence contains a plural direct object. This construction implies the passive voice.
A scuola si insegna poco il latino - Latin is less taught in school
A scuola si insegnano molte materie - A lot of subjects are taught in school

Impersonal phrases are usually formed also with the verb essere and a noun, an adjective or an adverb:
È una fortuna - It's a fortune
È bello, chiaro, evidente, importante - It's nice, clear, evident, important
È meglio - It's better