What should I pay attention to when traveling to Europe (France, Italy, Germany, Switzerland)?

A converter is necessary, because foreign power outlets are different from domestic ones, but it is also very convenient to buy. Generally, it can be bought at airports and railway stations. I don't know the voltage in other countries. The voltage in Italy is 130 V-220 V, so there is no need for transformers for household appliances.

1 1 month, except for southern Italy, the highest temperature in Rome is above 20 degrees. The other places you mentioned are already quite cold. At this time two years ago, it began to snow in parts of Germany.

If you live in a place like a youth hostel, you should bring everything, because you have everything except a bed, but if you want to stay in a hotel, you don't have to bring it. You can buy it locally. Convenience stores are very convenient and open 24 hours a day.

Also, try to go out together, don't do activities alone, don't go to remote and secluded places, don't bring too much cash with you, and talk less. I don't know much about other places, but in Italy, Asian tourists are often robbed. I was robbed when I first arrived in Italy. If I really see him, I will give him everything he wants. Safety and life are the most important.