Answer:
To organize the text and to make the text easier to read
We use subheadings to give readers a sense of what they are reading, not to make them think the work is legit, and not to introduce new information or point out important facts. We want readers to know what is coming, and what they are going to read so we don't waste their time
The supporting details should be included in the Body Paragraphs of an essay. The introduction is an introduction of what you plan to write about, and the thesis is included in the introduction where you specifically mention your main topics/points. However you elaborate on these in the body paragraphs and these elaborations are your supporting details. The conclusion is a summary of your essay and should not be introducing any new information.
Answer:
Anne wants to confide in other people, but she finds people less accepting than a page in her diary.