If someone messages you and wants to take the deal, do it with an escrow so your trade is safe. Choose the escrow from the link below.
(https://bitcointalk.org/index.php?topic=2439910.0)
It's because you're still a newbie and at the same time, there are scammers around the forum so, this is a step of measure for everyone to be safe with any deals they do inside the forum.