Since you are a beginner here in Forex Trading and wanting to know how to trade within Gold/Silver/Crude Oil, then i will say that dealing in Gold and Crude Oil will require significant amount of knowledge, information, skills, experience and money management. Because Gold and Crude Oil are most volatile elements, because when they do move, they move rapidly. As far as Swap/Swap Free Account is concerned then Swap means that you can get incentives on these and swap free account means that you perhaps will not get the incentive for this.