Train by xaver
Bologna is one of the most important train stations in Italy, you can go there by train from many italian and european cities.There is also an airport.
Many busses like for example eurolines (www.eurolines.com) connect Bologna to the most important european cities
Walking or biking (Romagna is popular for people using often bicycles) is the best way to visit Bologna, to move from Bologna to other italian cities....check the many train connections (www.trenitalia.it)