There are no such strict characteristics when it comes to communication, but there are certain things that you need to take care of while communicating with someone:

1. You must be mentally present there: You must pay attention to what someone is saying and you must not be distracted or engage with other things.

2. Understand and be right - so this is the important thing to watch out for. Sometimes we disagree with someone's opinion and we get stuck to prove that we are right, this is what one should never look for. You should see understanding instead of showing you are right every time

3. Value the person: if someone shares their really personal things, you must make them believe that you are not going to share it with anyone and make that person valuable.

4. Kindness: whenever you have conversations with someone, you should be polite. "Use goodness on your lips with the best lip tone you have ever used"

I hope my answer helps. All the very best for your future endeavors!