In 2020, I paid earlier taxes to IRS and my state for a freelance job I did. Where do I enter/in which section do I add the amounts I paid earlier last year?

Sounds like you made estimated payments?

You can type estimates paid in the search box at the top of your return and click Find and it will give you a link to Jump To it.

OR

To enter Federal or State Estimated Taxes Paid, including a state estimated payment made in January for the prior year, go to

Federal on left or at top.  Personal (Home & Business)

Deductions and Credits at top

Then scroll way down to Estimates and Other Taxes Paid

Estimated Taxes - click the start button

Then, For 2020 Federal Estimated payments should be on 1040 line 26.

These are the options I see under the section Estimated Tax Payments

1. Federal estimated taxes for 2020 (Form 1040ES) and

2. Local estimated taxes for 2020