What will you do if you have no money during the trip?

It's hard to say. With luck, maybe you can find a good place to eat and live. This is a more important part of the trip. You can't travel with the least money. Maybe you can make a very comprehensive and detailed strategy. Traveling abroad, you will find that different places have different consumption. For example. I live in Korea, and once I went to a restaurant, foreigners asked for expensive bills, and Koreans didn't care. This is not one or two, it's really a lot. So maybe it's not just strategy, but your calculation of money is also important.