Diploma certificates are generally issued by community colleges and professional colleges and are valid for 2-3 years. After graduation, students can transfer some credits to other regular universities for further study, or continue to study for postgraduate diplomas in colleges and universities.

Bachelor's degree certificate, generally issued by a university or university college, is valid for 3-4 years. You can get a general bachelor's degree or an honorary degree. The study time of an honorary bachelor's degree is usually longer than that of an ordinary bachelor's degree, the study content contains scientific research elements, and the course credit setting is also different from that of an ordinary bachelor's degree.

Master's degree certificate, generally 2-4 years, the length of time depends on the number of courses studied and whether there are paper requirements. Generally, a master of literature or a master of science takes a long time, usually writing a thesis and obtaining a degree after defense, while a professional master's time is relatively short, such as a master's degree in computer and business, which is generally about one and a half years.

Doctor of philosophy degree certificate, generally ranging from 3 to 5 years. General research work is led by tutors, and students in individual disciplines will also take some related courses, but mainly do papers. Finally, the thesis obtained a degree through defense.