Certain economic news releases can move the forex market a LOT, sometimes within seconds. Here are the ones that usually have the strongest impact:
1. Non-Farm Payrolls (NFP) – USA
Released monthly (first Friday)
Measures how many jobs were added/removed
Huge impact on USD pairs
Often causes fast volatility
2. Interest Rate Decisions (Central Banks)
From:
Federal Reserve (USD)
ECB (EUR)
Bank of England (GBP)
Bank of Japan (JPY)
Etc.
Rates affect currencies because they change how much yield investors get holding that currency.