Meet face to face, never pay for items you have not yet seen.
If an ad or reply sounds too good to be true, it probably is.
Use the "Reply to ad" button for your safety and privacy.
Don't reply to email addresses hidden in text and pictures.
Don't carry large sums of money with you when meeting up.
Tell others when/where you are going to trade and bring a friend.
Don't ship items - always trade face to face.