Ask HN: What would you teach your software engineering manager?

I am trying as a first shot here to gather information from you about what is missing from your management and leadership team. And what you as a software engineer would teach them if you had the chance. What would you change ? Why would you change it ? I am doing so because I am in progress of validating an idea which should result in a course which is to educate engineering managers and leaders towards what I have come to terms with is a a field-experience based approach (fred brooks comes to mind) and what I call common knowledge for what my own expectations are from engineering managers. What would you teach your manager about managing software developers and teams ?