i think USDCAD will be a good pair for beginners to trade .. this pair is fully related to the economy of the United States and someone tries to dominate the others so that it can see a very low range of pips up and down for this pair..CAD will actually be very strong from day to day so that it can be a clear movement for anyone and If you want clear movements and small volatility, Aud Usd is better than ASd Cad. In Aud pairs prices move like Gbp Usd but volatility is lower than Gbp so it is advantageous for followers of trends because prices can be predicted more accurately. But for beginners I still prefer Euro Usd as a general partner for trading.