My father is 83 years old and has studied US stocks for almost 52 years.

He summarized some simple rules for beginners:

1. Price falls 5% → Hold

2. Price falls 15% → Buy 10%

3. Price falls 25% → Buy 25%

4. Price rises 5% → Continue holding

5. Price rises 15% → Continue holding

6. Price rises 25% → Sell 10%

7. Price rises 35% → Sell 20%

8. Price rises 45% → Sell 30%

9. Price rises 60% → Sell 40%

10. Price rises 100% → Sell everything

Discipline + patience = stable long-term growth.

(Save this later)