If you work for a company, they should have sent you a 1099-NEC or possibly a 1099-MISC (in the past). This is the "non-employee" compensation form that reports your income if you are over the reportable threshold. You would then use the data on that form to enter into your Turbotax to figure your taxes.
If you have paper copies of your prior year returns, you can examine them to see how income was reported. Look for your 1099-MISC, 1099-NEC, or W-2 forms also.
If you are self-employed, you should be keeping your own set of accounting records that track income, expenses, etc. Many use Quickbooks or another software package that automates the record-keeping processes.
