Heard these while listening to The Wisdom of Success by Andrew Carnegie & Napoleon Hill.

Pretty timeless advice tbh.

1. Positive mental attitude
2. Flexibility
3. Sincerity of purpose
4. Promptness of decision-making
5. Courtesy
6. Tone of voice
7. Habit of smiling
8. Expression of the face
9. Tactfulness
10. Tolerance
11. Frankness of manner and speech
12. Keen sense of humor
13. Faith in infinite intelligence
14. Keen sense of justice
15. Appropriateness of words
16. Emotion control
17. Alertness to interests of others
18. Effective speech
19. Versatility
20. Genuine fondness for people
21. Humility of the heart
22. Good showmanship
23. Personal magnetism

Developing these attributes in young people would be much more valuable than learning trigonometry.