What certificate can I take for traveling?

If you want to be a tour guide, you must take a tour guide card (the exam is not compulsory in general schools).

Then some big certificates, such as teacher qualification certificate, accounting certificate, human resource management certificate and so on. Yes, but the cross-major exam is relatively difficult, depending on your own interests.

As for CET-4, CET-6, CET-2 and CET-3, it depends more on one's own interests and school requirements.

There are many jobs in the tourism industry, such as outreach, so-called business personnel, planning, tour guides and so on. If you want to be a tour guide, you need to get a tour guide card. When you sign up, someone will tell you that there are some people who specialize in selling books or training, so it is easier to verify.