The Ministry for Education, University and Research gives an answer to general questions.

The website is multilingual.

FAQ for international students studying/planning to study at any Italian University.
You'll find information about entry requirements, Italian university system, residence permit and mobility in EU for international students.

FAQ for international students studying/planning to study at Politecnico di Milano.

You'll find information about both general topics (how to get a student visa, residence permit, etc.) and specifically for Politecnico di Milano (courses, procedure for application, fees, scolarships, students facilities, etc.).

In English only.

FAQ for students planning to study at Politecnico di Milano (from Polimi Vocational office).
You'll find introductive information about university system, how Politecnico di Milano is organized and how it affects student university career.
In Italian only.

FAQ for international student that study or wish to study at UNIMI