Forlì is connected to quite a few national and international destinations through the L. Ridolfi airport, usually advertised as "Bologna Forlì". Flights to and from Forlì are usually operated by low cost companies (such as Ryanair and Windjet).
The closest major international airpot is Bologna's Guglielmo Marconi (Bologna) International Airport (IATA: BLQ) . To get to Forli will require a bus/taxi to Bologna Central train station then a train to Forli. A taxi from the airport to the Central Station costs about €15. An Aerobus Ticket costs €6, and it stops outside the main terminal building. The final train to forli will cost €6-10 and takes 50-70mins (almost all trains to forli will be listed on the departure board as destined for Ancona)
You don't need to stay safe from anything. It is maybe one of the safest cities in Italy.