The document outlines four steps an HR manager can take to prevent the best employee from resigning: 1) Talk to the employee directly to understand any issues or concerns and see if they can be addressed. 2) Show appreciation for the employee's work and make them feel valued through regular praise and feedback. 3) Offer support to the employee by helping overcome obstacles, providing the proper tools, and showing you care about their well-being. 4) Help put the employee's career goals within reach by advocating for their potential, connecting them with mentors, and helping them progress their career at the company.