The Ability to Specialise
Successful futures trading is a time consuming undertaking which requires close attention.
In many cases it requires diligence, follow through, and persistence.
Therefore, it is unfeasible for most futures traders to be involved in too many markets at one time.
I suggest that futures trading, in three markets is sufficient for the majority of traders.
In fact, for new futures traders, I would recommend specialising in only one market, attending to this market thoroughly and carefully in order to develop your skills and to increase your overall profits.