Learning trading it's easy, you already have it from the very beginning. It is just need some agreements with the other sides. This thing is usually used for selling or trading from people to the other.

Usually people cheat at you saying that he will give you what and you must give him what. So before he finished putting his things insde the box and agrees it you must not agree with the other person.

Trade is just a basic things to do and for beginner who find it hard to get money, ask some people there, because they are all kind, and some are not. Remember that!