The Best Career Advice You Never Hear by Emmie Martin compiles unique and often overlooked pieces of career advice that can significantly impact one's professional journey. The document begins by challenging the conventional wisdom of career advice, such as working long hours or always going the extra mile, and instead presents 13 unique tips sourced from a Quora thread. These tips include accepting social invitations at a new job to avoid becoming an outsider, not appearing too busy to avoid missing out on promotions, and the importance of doing unassigned work to add value to the company. Other advice includes understanding the implications of checking your phone during calls, helping others without expecting immediate returns, and recognizing the value of a network of former colleagues. Additionally, it emphasizes the importance of identifying and overcoming hidden weaknesses, learning by observing skilled colleagues, and making the next person's job easier in a workflow.