tl;dr: Dale Carnegie’s How to Win Friends and Influence People is what Robert Greene was trying to redo with The 48 Laws of Power and The Art of Seduction (both of which I’ve previously reviewed).
It’s probably the only “self-help” book I’ve ever read that didn’t either talk down to you, nor treat you as superior for having read it.
The book is constantly interspersed with personal anecdotes and does not present itself as a directive, but as a set of examples (positive and negative) that you can pick and choose from, but which should be mostly “picked” and “chosen”, and not so many left behind.
I cannot recommend this book highly enough. I also think that you cannot read (and reread) this too young.