You'll probably see Cattedrale dellAssunta across town before you actually find this grand religious building. Rest a while inside if the doors are open or just admire the facade from the street.
When you've spent some time at this principal church in Savona, why not make your way to Varazze Marina, Celle Ligure Beach, and Cappella Sistina di Savona? They're not far from Cattedrale dell'Assunta and also popular with many tourists.