You can follow the following tips and steps when buying and selling on the open market site:
1. Choose the seller wisely.
2. Do not make any money before getting the service provided by the seller.
3. Order actual product images.
4. Know the product status. (Ask them all major and minor inquiries about the ad (such as product status, sales reason, and product details).
5. Make sure the price of the product so that it is reasonable limits (if you have no idea how to price the product you can do a quick search to get an idea of the price).
6. Use secure payment methods.