The Effective Executive by Drucker is a great intro to leadership. He puts the role in the context of getting results.
A couple other thoughts:
1 - Communicate the same message over and over. Do it verbally and in writing.
2 - Have weekly 1 on 1s with all your reports. They should own the first 20 mins. You own the last 10. Take notes.
3 - Make sure Meeting notes go out for every meeting.
4 - Talent is your job, not HRs. It’s up to you to hire and train the good, and nudge out the bad.
5 - Assume you only get your best people for 1-2 years. Plan for succession.
6 - A good relationship is “My top 20% will work for me again” and not “Everyone is my buddy”
7 - Be careful about off work socializing. If you go to a happy hour with subordinates, disappear after the first round. Don’t make these events mandatory.
8 - Keep performance discussions between you and your reports. Don’t belittle anyone to their peers.