I'd say if you start with these three then all of the rest of the goals get much easier.

❏ Understanding my reactions to statements made by others.

❏ Listening to others.

❏ Understanding others.

All adding up to understanding others motivations.

If you are Machiavelli or Mother Teresa you won't get far if you can't understand what or why others are pointing the direction they are headed. If you don't know what direction a ship is headed it's impossible to apply appropriate force to move it in a more desirable direction.

After that one needs to know ones own mind. If you don't know what you want or why you want it, it's very hard to make others understand or support your vision.

An understanding of basic rhetoric goes a long ways toward aching many of these goals. Constructing arguments with the three basic rhetorical legs of Ethos, Pathos and Logos is a tried and true method for changing minds or at least opening them a bit. Putting arguments against your position on the table to be openly dealt with challenges both your own defensive biases and opens cracks in the opposition's position by allowing that their concerns are being considered.

A few rhetoric classes go a long ways toward developing critical thinking skills and learning how to persuade others.

There are a bunch of communications skills that can be learned and drilled, I don't know where you go to learn them, I picked most of them up from a bunch of zany cultist. It's just a collection of habits like when someone comes to you with a problem, listen to their problem, restate in your own words their problem back to them, get an acknowledgment that you correctly understand their problem, and then try to work out a solution. When you go to someone with a problem try to reverse that whole process. Be able to look people in the eye, practice looking people in the eye with a partner. Practice saying sorry with a partner, practice it with a touch on the arm. I got a laundry list of things like that most that I probably don't consciously remember but still use because I drilled and practiced them.