As a role-playing game WOW has extensive expertise can establish the economic foundation of the game. There are 11 kinds of professional skills for players to choose, that include mining, skinning, herbalist, tailoring, enchanting, forging, alchemy, engineering, design jewelry, leather, and Inscription, these skills are divided into two kinds of collection-based and manufacturing and players can choose from two. Players in the game and the resources available through professional product you can put the city in the auction house for trading with other players. Many players choose two to match the business skills; it can be collected immediately after the resources needed for manufacturing. In addition, there are five secondary skills in the game: first aid, cooking, fishing, riding, and archeology. Expertise with the major difference is that professional skills can not be forgotten while the secondary skills and professional skills will reach a certain level to give players different attributes and skills awards.