To gain trust and build rapport, you need to hear out what the other person thinks without interrupting or disagreeing.

Try asking open-ended questions, like: "Why do you think that?"

If you mimic your opponent (in a subtle way), they are more likely to believe you.

For example, if they are sitting cross-legged, wait a few seconds and cross your legs too. And make sure that what you are doing is not too obvious.

...while you listen. This makes the speaker's arguments less persuasive, which makes your opinion look strong.

Fix the speaker in your sight as soon as they start speaking.

Repeating an argument back to the speaker can develop trust by proving that you're listening.

Try paraphrasing what you understand, using: " so you're suggesting ... because... ?"

• Know your facts thoroughly. 
• Use scientific-looking visuals (elements that people associate with science, like formula or graphs).
• Demonstrate that other people agree.
• Using phrases that indi...

1. Instead of attacking someone's ideas, try taking your opponent's basic beliefs and developing them into an absurd conclusion.
2. Flag your opponent's' dangerous beliefs.  It may have a positive effect on neutralizing your opponent.
3. Identify the shared ground bet...

• Watch your posture. The most effective one is with your feet together and palms down or letting them move with the words.
• Don't get nasty. Validate your opponent's self-worth by being nice to them so they will be more receptive.
• Avoid using too many facts.