Simple rules for beginners from a person on Binance who is (83 years old, studied American stocks for 52 years):
Price drop 5% → Hold the stocks
Price drop 15% → Buy 10%
Price drop 25% → Buy 25%
Price increase 5% → Continue holding
Price increase 15% → Continue holding
Price increase 25% → Sell 10%
Price increase 35% → Sell 20%
Price increase 45% → Sell 30%
Price increase 60% → Sell 40%
Price increase 100% → Sell everything
💡 Summary: Discipline + Patience = Stable Long-term Growth