Other Income Taxes is a summary number that summarizes ALL of the taxes you have paid either directly or through withholdings on Forms such as W2s, 1099s, etc. Because of this it is often quite large, but - even though it is in the Deductions and Credits section - it is not directly related to any deductions or credits etc; its just a one stop shop to see all of your taxes paid.
If you click the Start button next to the Other Income Tax section and then click the blue link "Where does the other income taxes amount come from?" you can get an exact breakdown for your return. See screenshot below.
But, for example, that number would include both of your Federal and state withholdings. It can also include local taxes, refunds applied to this years taxes from a prior year, balances due from prior years that were paid in this year, and payments made with any extension you might file.
