I would advise you to trade EUR/USD as the most significant qualities of a currency are often stability and liquidity. The pair has strong liquidity and volatility, but not excessive volatility. This pair is also the most-traded and most-loved pair. The reason for this is that the Euro and the Dollar are the world's two largest currencies. Other currency pairs to consider are USD/JPY, GBP/USD, USD/CAD, and AUD/USD.