What is a thesis? How to write?

In fact, for students in the first year of junior high school, the teacher said it was an essay, but it might be an ordinary argumentative essay. It is actually not difficult to write a paper about the history of tourism development in Xiamen. For junior high school students, it is just about writing an essay, and there is no need for professional formatting or anything else. Moreover, if it is a paper, it will not be 800 words, but it will be tens of thousands anyway. . . .