What does this mean? "Tax and Interest Deduction Worksheet: Total state and local sales tax rate-1 must be entered."

You must enter the sales tax rate of your area. 

The state sales tax rate is the rate that is charged on the tangible personal property (and sometimes services) across the state. These usually range from 4-7%. For example, the state rate in New York is 4% while the state sales tax rate in Tennessee is 7%. 

I am attaching the following attached tools for your reference.  Enter your zip code to obtain the information.

https://www.taxjar.com/sales-tax-calculator/ 

https://apps.irs.gov/app/stdc/