The general college lasts for 3 years, and you can get a bachelor's degree after 4-5 years. You can apply for a master's degree after graduation, study for 2.5-3 years to get a master's degree, and then get a doctorate for 2-3 years after graduation. A doctorate is the highest degree you can get in a university.

As for postdoctoral doctors, they are just a name when they graduate to do research.

Education refers to a paper diploma obtained after graduation from school or after graduation. In real life and work, it refers to the last and highest-level academic certificate, which is proved by the academic certificates issued by schools and other educational institutions that have been approved by the administrative department of education and implemented academic education and authorized by the state to issue diplomas.

Broadly speaking, any learning experience can be an "education" for learners. In society, what people usually call "educational background" has a specific meaning and value.

What academic qualifications a person has refers to the last and highest level of a person's learning experience, which is issued by schools and other educational institutions that implement academic education and authorized by the state to issue diplomas.