Basically, I do recommend everyone to trade major currency pairs in order to reduce the possible risks associated with trading. These pairs are more predictable and well-studied, there are many educational resources which can make you improve your knowledge and skills in trading which is very important for a trader.
However, I still think that traders should also study some minors, at least a couple of pairs. From my perspective, minors have bigger potential profits. I would like to point out that it doesn't make sense to start trading them if you know nothing about the economies and pecularities of the countries which they represent. You should study really hard in order to gain the rewards from the knowledge which are not common among trading community as a whole. You shouldn't forget about the risks. The trading strategies will be different from the ones which we got used to trading majors and you will have to create and test your own brand new strategies, but, in my opinion, the game is worth the candle.