How much does it cost to travel to Schengen countries for three weeks? Besides, how much does it cost to apply for a visa? What should I pay attention to when applying for a visa?

It depends on which countries you go to. Do you want to buy anything after you go? This is different for everyone. I went by myself, 10 days, and it took about 15000. I didn't buy anything. I didn't go shopping because I went to school in England. As for the visa, my parents got it from Beijing and came down in a week. When you apply for a visa, the staff will tell you when to pick it up. You can buy insurance online or find a travel agency to handle it. Actually, it's travel insurance, as long as it covers your trip these days. I applied for a visa in the UK myself, but my parents went to a travel agency in Beijing, depending on which one you choose.