where do i enter business expenses?

You can enter 1099NEC or cash Self Employment Income into Online Deluxe  but if you have any expenses you will have to upgrade to the Premium version.

Where to enter expenses in the Online Premium version

https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-self-employment-business-expenses-like-home/L1k6HJY4A_US_en_US

Ordinary and necessary business expenses to offset self-employment income may be deducted against self-employment income on IRS Schedule C Profit and Loss From Business.

In TurboTax Premier Online, report self-employment income and expenses by following these directions:

• Down the left side of the screen, click Federal.
• Down the left side of the screen, click Wages & Income.
• Click on the drop down arrow to the right of Self-employment.
• Click to the right of Self-employment income and expenses.
• At the screen Tell us the type of self-employment work you do, enter the answer and click Continue.
• Establish the self-employment activity and report the income and expense.

See this TurboTax Help.

@Congo621