The Best Advice I Ever Got, Lessons from Extraordinary Lives by Katie Couric published in 2011. This is a collection of 117 short interviews.
Donald Trump: know everything you can.
“My father told me, ‘Know everything you can about what you’re doing.’ He was my mentor, and I spent time working with him and watching him for many years. He had a comprehensive approach to his work and his life, and I learned a lot from being around him. What he told me in that short sentence had great significance as I grew up and became a businessman myself. I understand now how important it is to be thorough and well prepared in daily life. It has to do with focus; without focus, things can become difficult as well as unproductive. So know everything you can about what you’re doing–which is a daily commitment to education, excellence, and persistence.”
Trump does not practice what he preached.