I live in Texas - I am not understanding this total sales tax rate its wanting me to enter

Google 'sales tax rate for__ <insert your county>__ county, Texas'.   TurboTax needs to know what the general and local (if any) sales tax rate was where you lived in 2023, so we can calculate your sales tax deduction.   If you itemize and live in Texas, this deduction will be larger than the state and local sales tax deduction.   TurboTax will choose the larger of the two to put on Schedule A (itemized deductions).

Example:  Googling the sales tax rate for my county, I would enter 7.5 based on the following results:

 .....rate is 7.5%. This is the total of state and county sales tax rates.  The FL state sales tax rate is currently 6%. The Dade County sales tax rate is 1.5%.....