Receiving a gift and/or making a 529 plan contribution should not result in you having taxable capital gains. This is clearly an entry error.
As @ThomasM125 said, a gift is not reportable income, or a deduction, and should not be entered on your tax return.
For most people, you also don't enter a contribution to a 529 plan. There is no federal deduction for making a contribution to a 529 plan, so there is no place in the TurboTax (TT) Federal program to enter it. TT will not be tracking your contributions.
Some states allow a deduction, on the state return. If your state is one, it will come up in the state interview; usually in the "Here's how (your state) handles income differently" section. If you state allows a carryforward, the TT state program will track that.
For a state list of eligible plans, see: https://www.savingforcollege.com/article/how-much-is-your-state-s-529-plan-tax-deduction-really-wort...
