1, Studying abroad: To study abroad, English-speaking countries need to have a certain level of English, preferably IELTS or TOEFL scores. In addition, if you are a student, you'd better have proof of your parents' property to ensure that you have enough viability abroad, as well as various academic certificates and notarization of your academic degree certificate abroad.
2, work, you need to have a foreign job invitation letter, work certificate, income certificate, etc. You need to apply for a visa.
3. To visit relatives, it is generally necessary to prove the invitation letter (in foreign language) of foreign relatives, the proof of relatives' accommodation abroad, the proof of real estate, and the applicant's own identity certificate and bank deposit certificate.
4. Travel abroad. Short-term tourist visa requires air ticket reservation, hotel reservation at the place of arrival, as well as my identity certificate, bank deposit certificate, work certificate and so on.