In my w2 box 18 19 and 20 are empty and im not sure what to put in the box

You can just leave those boxes blank (don't put 0s there) unless you had any local/city taxes withheld. Those boxes are to report local tax withheld information.

what do I do to file if my boxes 18 19 and 20 are blank?

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@ingalls24 wrote:

what do I do to file if my boxes 18 19 and 20 are blank?

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Then you leave those boxes blank on the TurboTax W-2