General information on how Italian universities are organised and function is available on the website of the Ministry of Education, Universities and Research: MIUR
A special search engine offers a complete list of Italian universities: All you need to know about degree programme classes (almalaurea.it)
Foreign students interested in studying at Italian universities can find information on the admissions reserved for them at the site of the Ministry of Education, Universities and Research: Universitaly – L’Università italiana a portata di click