I’m not sure what it’s wanting me to enter for sales tax?

[DawnC0]

TurboTax calculates a 'base estimate' for your sales tax deduction based on your address and income.  To that estimate, you can add sales tax paid on 'large purchases' (vehicles/building materials).

TurboTax asks you if you want to use the estimated sales taxes paid OR would you rather enter all of your purchases/receipts manually.  Most people use the estimate and add sales tax on larger purchases.