Define the main idea of your essay. The main idea is the general subject your thesis statement will be about.
Narrow down the main idea of your paper or essay. The more specific the topic, the easier and more effective the thesis statement will be. For example, instead of writing a paper on reading, write one about your favorite genre to read.
Add an opinion to the main idea. A solid thesis statement includes some point that you can argue. Then prove this point in your essay.
Complete the thesis based on the decisions you're made. For example, your thesis might be "Mystery stories are the most fascinating genre to read." Then, you must provide evidence in your essay that proves mystery stories are more fascinating than other types of stories.