Not all Forex pairs behave the same during certain market events. Even among majors, there is a large difference in liquidity, volatility and active market hours among them.
As a beginner, it might be a wise decision to focus on the most-traded currency pairs such as EUR/USD, USD/JPY and GBP/USD. Trading these currencies will likely reduce trading costs and slippage, and you’ll be able to avoid chaotic movements that may arise as a result of low liquidity in other pairs.