How I trade in Yugioh!!

In yugioh I trade by buying cards or trading undervalue and selling on or above value. That is how I make my profits and how I was living off of yugioh cards. You also have to get to know people and their habits and what they like to buy. Everyone who has a trade book and sell is a buisness but, everyone is not good at it and you can talk people into buying and trading cards they don't want to. It's all about your tone and whether you know or look like you know what you talking about. It also helps to have backup when trading because it influences people that you are correct.