Are there different of quests’ hard?
Yes, each difficulty level has different quests. Of course, relatively simple quest only offer players a lower the experience, fewer items and less WoW gold, the quest is more difficult to allow gain a high experience, more attractive items and WoW currency. If player who do all simple quest, you are must lack of WoW gold and you have to buy WoW gold from others. Game will be “elite” quests which offer players more experience and rewards, but usually it must make players to make up a team, and then go to complete it.