The art of Rhetoric is one of the oldest and most venerable. https://en.wikipedia.org/wiki/Rhetoric https://en.wikipedia.org/wiki/Rhetoric You're going to wan

The art of Rhetoric is one of the oldest and most venerable. https://en.wikipedia.org/wiki/Rhetoric https://en.wikipedia.org/wiki/Rhetoric You're going to want to familiarize yourself with fallacies and bias, to prevent and counteract your own. https://en.wikipedia.org/wiki/List_of_fallacies https://en.wikipedia.org/wiki/List_of_fallacies https://en.wikipedia.org/wiki/List_of_cognitive_biases https://en.wikipedia.org/wiki/List_of_cognitive_biases Read the works of great writers and thinkers (E.g. the Meditations of Marcus Aurelius https://en.wikipedia.org/wiki/Marcus_Aurelius https://en.wikipedia.org/wiki/Marcus_Aurelius https://en.wikipedia.org/wiki/Meditations https://en.wikipedia.org/wiki/Meditations also I recommend Wendell Berry.)