The people saying 0 are misunderstanding the question.
If you want the lowest witholdings, you need to put a larger number of exemptions on your W4.
Ideally you would calculate your taxes and find the highest number that still results in you not owing money next year.
If you pick too big a number, you don’t get a tax refund, you will owe taxes, possibly with penalty.
For a single person with 0 dependents, put ‘1’ unless you’re willing to do the tax math to justify a higher number.