A prompt is a question assigned by your teacher or decided by you.
The objective is to look for a specific subject in your topic which you can argue about. There are many aspects of education that can be expanded like the laws, the system and others. A narrow subject like the effects of education at present allows for a clearer focus.
Normally your instructor will assign you this, but if you will be the one to choose them, you should understand that these will greatly affect the thesis statement.
If you will be writing a persuasive paper, your main objective is to prove something to a particular group.
For a descriptive paper, you aim to describe something to a particular group. If you know the basic formula, you will not only maintain your thesis within the right length but it will likewise help you see that the argument should be well-organized.
Your question might be why does it have to be disputable?
Isn't it good if everybody agrees with your thesis? Yes, it would be an easy thing for you if no one will object on your claim.
Consider the same topic we used in the above questions.
The failure can be resolved, but what if you need around 20 pages to explain your thesis about education and you are only allowed to make a five pages thesis?
And no, because a thesis statement for education essay should be fresh, and created to invite others who are interested in the subject to engage in the discussion about your topic, triggered by your argument.
The best way to approach your thesis statement is to look at the essay as a way to tackle your subject and not a final statement.