How to Win Friends and Influence People was a book I read when I was a teenager. It was inspiring. Wikipedia has a page nicely summarizing the points:
"If you're wrong, admit it quickly and emphatically."
"Ask questions instead of giving direct orders."
"Let the other person save face."
"Praise every improvement."
"Encourage them by making their faults seem easy to correct."
"Make the other person happy about doing what you suggest."
Another good book is The 7 Habits of Highly Effective People
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