Tax Year Prior to 2020: I sell products on line. I have office supplies, cost of materials, postage, and ebay fees. Not sure what sections to enter these .

[alfie898]

not now

[KarenL2]

You can choose the most appropriate section and enter them there.  Read the blue text links and Learn more links for examples.  If in doubt, you can enter an expense as Miscellaneous Business Expenses. 

How to get to that area :   While inside the software and working on your return, type Schedule C in the Search at the top of the screen (you may see a magnifying glass there).  There will be a popup that says Jump to Schedule C.  Select that to get to the general area. 

Then, 

• Business Income and Expenses
• select Edit next to your business (if it is there)
• scroll to Business Expenses
•  then, Other Common Business Expenses
• on that screen you will see categories to chose from or Other Miscellaneous Expenses