Show the real item
Use your own photos in good light. Include the front, back and any signs of wear. Avoid filters that change the colour or hide damage.
Make the description useful
Include the size, condition and what comes with the item. If something is missing or does not work, say so clearly. An honest detail now can prevent a misunderstanding later.
Agree before the exchange
Answer questions in the item conversation. Confirm the price, handoff and any delivery cost before committing. Do not assume payment protection or a courier service is included.