The structure of a thesis statement depends upon the nature of controlling essay type.In simple terms, first a thesis statement will have a main topic sentence formed from questioning it, then the writer's statement regarding the topic sentence, and finally ends with the specific supporting points detailing the writer's statement for justifying its relation with the topic sentence.
The main idea is not arguable like the thesis statement should be; it's simply an idea.
Before writing, you should first develop the main idea because you cannot generate an arguable thesis statement about a topic until you have identified what you think of the topic.
In general, it should have a supportable opinion (specific/focused) and clear intent for the essay.
The thesis statement is a one-sentence statement that expresses the main idea of the essay.
The goals of the thesis statement are to organize and development your argument and provide your reader with a road map or guide to your argument.
The thesis statement should answer a question about the topic you are exploring as a writer.
The thesis statement is developed, supported, and explained in the course of the paper by means of examples and evidence.
Thesis statements help organize and develop the body of the writing piece.
A good thesis statement will express only one main idea and will assert your conclusion about a topic.
If you are given a topic to write about, it's important to first do your research and identify some main ideas associated with that topic.