The vast majority of ads are posted by honest people and trust. So you can do excellent business. Despite this, it is important to follow a few common sense rules following to prevent any attempt to scam.
Doing business with people you can meet in person.
Never send money by Western Union, MoneyGram or other anonymous payment systems.
Never send money or products abroad.
Do not accept checks.
Ask about the person you're dealing with another confirming source name, address and telephone number.
Keep copies of all correspondence (emails, ads, letters, etc.) and details of the person.
If a deal seems too good to be true, there is every chance that this is the case. Refrain.
Recognize attempted scam
𝗧𝗵𝗲 𝗺𝗮𝗷𝗼𝗿𝗶𝘁𝘆 𝗼𝗳 𝘀𝗰𝗮𝗺𝘀 𝗵𝗮𝘃𝗲 𝗼𝗻𝗲 𝗼𝗿 𝗺𝗼𝗿𝗲 𝗼𝗳 𝘁𝗵𝗲𝘀𝗲 𝗰𝗵𝗮𝗿𝗮𝗰𝘁𝗲𝗿𝗶𝘀𝘁𝗶𝗰𝘀:
The person is abroad or travelling abroad.
The person refuses to meet you in person.
Payment is made through Western Union, Money Gram or check.
The messages are in broken language (English or French or ...).
The texts seem to be copied and pasted.
The deal seems to be too good to be true.
https://carmart.ng/page/anti-scam