Credit cards are more convenient and safer in these big cities. It is dangerous to carry a lot of cash when traveling. There are many thieves in Italy, and they are very famous. Be careful! ! They only steal foreigners, not locals, and the police are not enthusiastic about helping you catch thieves, so it is not safe to have a lot of cash! Be careful when taking a taxi in Italy. Tell him to open the counter, or they will charge sky-high prices. You can't tell the pain. Italians are very dishonest, so be careful when buying things. If the purchase price exceeds 100 Euro, the tax refund can be made at the airport.