You can look at form 1040 to verify that you are getting the standard deduction plus $600 if you had charitable contributions totaling at least $600. It is on line 12a & 12b and the sum is on line 12c.
Ordinary income tax is applied to the amount of ordinary income in excess of the standard deduction. Here are the tax brackets for your ordinary income (W-2 and other ordinary income and short term capital gain or loss):
10% for income up to $19,900
12% for income from $19,901 to $81,050
22% for income from $81,051 to $172,750
If your ordinary income less the standard deduction is less than $80,800, then your long term capital gains that make the total equal to $80,800 are taxed at 0%. Any long term capital gains in excess of that amount are taxed at 15%. You cannot use the capital gains amount on line 7 of form 1040 because that is a sum of your long term gains and your short term losses. That sum is not used for any tax calculation.
You can see how the capital gains tax is calculated on the Qualified Dividends & Capital Gain Tax Worksheet. You will not be able to see that worksheet when using the online product until you have paid for the product.
