When deciding which currency pairs to trade in the Forex market, there are a few aspects to consider:

1. Volatility: Some currency pairs are more volatile than others, implying that they can see higher price swings in a shorter period of time. If you are a risk-averse trader, you should select currency pairs with lower volatility, whilst more aggressive traders should select currency pairs with more volatility.
2. Spread: The spread is the difference between a currency pair's bid and ask price. Traders may choose pairs with a narrower spread because it costs less to enter and exit deals. However, keep in mind that some pairs with modest spreads may also be less liquid, making it more difficult to enter and exit.
3. Trading hours: Because different currency pairs have varied trading hours, it is critical to select pairs that correspond to your trading availability. For example, if you can only trade during the Asian trading session, you should concentrate on pairs that are more busy at that time.
4. Correlation: Currency pairings that have a significant positive or negative correlation tend to move in the same direction. When trading correlated pairs, it is critical to analyze the impact of one pair on the other.
5. Own preferences: In the end, the currency pairs you trade should be in line with your personal goals and risk tolerance. It may be beneficial to try out different combos and discover which ones work best.

It is also crucial to know that, rather than focusing on just one or two currency pairings, it is normally advisable to diversify your portfolio by trading a variety of other currency pairs. This can help to disperse risk and potentially boost profit potential.