It is either the Standard Deduction or Itemized Deductions on schedule A. If you used the Free Edition that doesn't let you Itemize so you should have the Standard Deduction. How much is it?
For 2018 the standard deduction amounts are:
Single 12,000 + 1,600 for 65 and over or blind
HOH 18,000 + 1,600 for 65 and over or blind
Joint 24,000+ 1,300 for each 65 and over or blind
Married filing Separate 12,000 + 1,300 for 65 and over or blind
