If you are a master's or doctoral student, the whole experiment is completed by yourself, and the paper is written by yourself, then the first author is you, and the correspondent usually countersigns your tutor, because he is the one who provides you with funds. Of course, some of your brothers and sisters may have helped you with some of the content, and they also want to be named, usually behind you, that is, the second author and the third author. . . . But the first name is you, the first author (representing the greatest contribution), and the last name is your tutor and correspondent (representing the first person in charge). A paper only looks at the first author and correspondent, and the others are all soy sauce, so you just need to make sure that the first author is you and the correspondent is your boss, and you don't have to worry about the other middle Zhang Lisan.

From an academic point of view, the first author of an article is as important as the correspondent, and there is generally no phenomenon that tutors and students grab the first author. If one day, I mean, you won the Nobel Prize for this article, it is estimated that you will share it with your tutor, and it has nothing to do with other soy sauce writers caught in the middle.