In college/uni, how should essays be written?

In college/uni, how should essays be written?
In high school we learned the “hamburger” style, but in college they don’t really explain how they want it..

You should really ask your teacher what he/she expects. Do they want MLA format or APA? I have always started my essays with an introduction that includes my thesis statement. Then I start the body of the essay – the points I am trying to make. Each paragraph should have a topic sentence that states what you are going to talk about in the paragraph. It needs to follow your thesis statement. I end with a conclusion – the final argument. I do not simply restate what I have already said in the essay. I look at it as my last chance to win over the reader.