Know your own importance
You are the most important person in your team, and you’d better know it. No, not because you’re a better person or more experienced or more valuable or anything to get big-headed about. You’re the most important person because everyone else will take their lead from you. You set the bar.
If you play dirty, backstab, worry that your team members are better than you, spy on them, try to stop them outshining you, or are unethical, disrespectful, or anything else of the sort, then you’re not going to excel as a manager, and your team will be so busy checking over their shoulders that they won’t perform, and your department won’t shine.
Maybe you don’t get involved in all that nasty stuff? Good, pleased to hear it. ...