To study in Europe, non-EU students generally need a student visa or residence permit, depending on the country and the length of their stay. EU/EEA students can study in other EU countries without a visa but might need to register with local authorities. 
Here's a more detailed breakdown:
1. Visa Requirements:
EU/EEA Students:
Generally, EU/EEA citizens can study in other EU countries without a visa but may need to register with local authorities.
Non-EU Students:
Will likely need a student visa or a residence permit, depending on the country and the length of their studies.
Short-term studies (less than 90 days): May require a short-term Schengen visa.
Long-term studies (over 90 days): Will likely need a long-term student visa or residence permit.