https://www.amazon.com/Ultimate-Sales-Machine-Turbocharge-Relentless/dp/1591842158
This is a great book on how to sell and develop some good manager skills specifically and other than that it’s a good book in general. Holmes taught me a simple and very effective way of managing my time in the first chapter. For that reason alone I would recommend the book (or at least reading the first chapter at the library). Next he discussed better ways to run meetings and get the most productivity out of a team. Additionally, one of his most important insights is that all the great ideas in the world won’t help anyone do anything if you don’t have the “pig headed discipline” to implement the idea and follow up to make sure everyone is acting on it. I have found this to be the case in my own life many times over when I learn a new time management technique but don’t stick with it and ultimately revert back to my old poor time management habits.