Bologna is a beautiful city with so much to see and do. Here's an ideal itinerary for 3 days in Bologna:

Day 1:

Start your day by visiting the Piazza Maggiore, which is the heart of the city. You can admire the beautiful architecture of the Basilica di San Petronio and the Palazzo dei Banchi. After that, head to the Two Towers, which are the symbol of Bologna. Climb up the Asinelli Tower for a stunning view of the city. In the afternoon, visit the Archiginnasio, which was once the main building of the University of Bologna. It now houses the Anatomical Theatre and the Library of Medicine. End your day by enjoying some delicious Italian cuisine at one of the many restaurants in the city.

Day 2:

Start your day by visiting the Santo Stefano complex, which is a group of seven churches built on top of each other. It's a unique and fascinating place to explore. After that, head to the Mercato delle Erbe, which is a bustling market where you can find fresh produce, meats, cheeses, and more. In the afternoon, visit the Museo Civico Archeologico, which has a fantastic collection of Etruscan and Roman artifacts. End your day by taking a stroll through the Giardini Margherita, which is a beautiful park in the heart of the city.

Day 3:

Start your day by visiting the Sanctuary of the Madonna di San Luca, which is a beautiful church located on top of a hill overlooking the city. You can either walk up the hill or take the funicular railway. After that, head to the Quadrilatero, which is a maze of narrow streets filled with shops selling everything from fresh pasta to handmade jewelry. In the afternoon, visit the Pinacoteca Nazionale, which has a fantastic collection of Italian Renaissance art. End your day by enjoying some gelato at one of the many gelaterias in the city.

I hope this itinerary helps you plan your trip to Bologna!