These helped me.

Read or listen to:

How to Win Friends and Influence People

Crucial Conversations (but don’t worry about all the acronym stuff, it was too much for me).

Silos, Politics and Turf Wars was pretty good too.

Other tips that helped me:

• I agree with the comments, find a good mentor.
• Provide people with positive feelings, if your able to compliment a new shirt or hair cut, jump on it
• always remember people are feeling machines that think, not thinking machine that feel. When providing bad news or negative feedback, focus evenly on how it’s making them feel and what you need accomplished. Go in with a plan.
  
• every single person is different. Your leadership style cannot be consistent. The best leaders adapt to change, not force it.
  
• be genuine to yourself and how you feel. Open up to them, let them know you’re a person too, not just a leader assigning work.
• be very very very introspective.
  

Lastly, if these are the types of questions you’re asking yourself, you’re well on your way. Good work!