Referential regulations
You can find all of the referential Italian regulations on the ENAC website in its dedicated page:
https://www.enac.gov.it/sicurezza-aerea/droni
For the latest updates on the subject:
https://www.enac.gov.it/ultimi-aggiornamenti
https://www.enac.gov.it/la-normativa/normativa-enac/linee-guida/lg-2020001-nav