It’s a matter of personal preference. All pairs move differently because every pair has different liquidity and volatility. Traders should pick pairs on these two factors, so they can get the desired returns.
Traders should try to focus on and master 1-2 currency pairs initially. Major pairs like EUR/USD, USD/JPY, GBP/CHF, and EUR/CHF are good options for new traders to start with. Once you get better at these pairs, you can gradually add more pairs to your portfolio.