Hi there!
Even though this question was submitted a week ago, I'd love to give pointers to those that may stumble upon this question asking for help.
A thesis statement is basically stating what your whole essay is about, and is based on your opinion. It's usually located at the end of your opening paragraph, and is short, sweet, and straight to the point (being a sentence long). When drafting your thesis statement, keep in mind the three, or two, ideas that you wrote about or are writing about in your body paragraphs. A thesis statement is kind of like paraphrasing, just making your main ideas of the body paragraphs provable.
Your thesis statement can, and is reccommended to be restated in your closing paragraph. When restating your thesis statement, I don't recommend to use the same exact sentence- change it up a bit.
An example of a thesis statement;
Peanut butter and jelly sandwiches are the best type of sandwich because they are versatile, easy to make, and taste good.
This means that my essay is focused on proving that PB&J is the best type of sandwich. My body paragraphs will be about it's versatility, how it's easy to make, and it's taste.
Hoping I helped some!