9 and 21 ema corrosing

Basic Logic

Buy Signal (Bullish)

• 
  EMA 9 crosses above EMA 21
  
• 
  Shows short-term momentum becoming stronger
  
• 
  Enter BUY after candle closes above the crossover
  

Sell Signal (Bearish)

• 
  EMA 9 crosses below EMA 21
  
• 
  Shows short-term momentum weakening
  
• 
  Enter SELL after candle closes below the crossover