If its a crush,
you will feel nervous and jingly about seeing the person. You heart will flutter and you can't speak properly. Eg stuttering in front of the person, unable to make out words or start a sentence logically. You will want to be with the person all the time. You feel like you … Read more
Assertive and confidence. That also means good body language, including eye contact and appropriate gestures.
You have to believe in your ideas if you want to persuade someone to be on your side.
Lexicon is important as well. It won't be an effective argument if you use "like" in every sentence...
Tools to have: Counterarguments, … Read more