So during you browsing Survivingitaly.com and other website, you will see different websites mentioned, we summarise a list of some of the important ones here.
Agenzia delle Entrate – Home (agenziaentrate.gov.it)
The Agenzia delle Entrate is basically the equivellent of the Tax Agency, HMRC etc. They issue your Codice Fiscale and also deal with all tax issues in Italy.
Noi Italia 2021 – home (istat.it) – Istituto Nazionale di Statistica
ISTAT is the official statistics agency of Italy, you will often see reports mentioning the data it also includes official European data and provides data to Eurostat the European data organisation.
English (UK) 
Italiano