How do i know if I took standard deduction or itemized deductions?

Look on your return line 40.  If this line agrees to any of the amounts below based on your filing status, then you took the standard deduction:

MFJ $12,600

Single $6,300

HOH $9,250

My taxform says the standard for MFJ would be $12,700 (not $12,600).

One way to be sure whether you took the standard or itemized deduction is to look at your turbo tax forms from last year. Open your app from last year. Open your tax file. Then click on "forms" in the right hand area of the upper blue banner. If you itemized deductions, you'll have a "Schedule A - Itemized Deductions" form in your federal forms list.