Psychology trick that works because I use it
Help other people whenever you ca, but if you can't, be honest about it.
It makes people like you more, and makes people more likely to help you, because they'll like you, and feel indebted to you, but since you couldn't help them all the time, you're not invincible.
Psychology trick that works because I use it
If you're just getting to know someone, don't talk about yourself, ask about the person you're getting to know, and ask questions about what they do, to engage with them.
This lets them know that you care more about them than yourself despite not knowing them at all, which will make people respect and like you more.
Psychology trick
In principle, that makes sense, but it doesn't come off that well in practice. Tell me I'm wrong (or to be diplomatic, say my *argument* is wrong) and I have to defend my position, but tell me you disagree and I'm not going to bother. I have no desire to spend any effort convincing a guy who's going to ignore what I say because "it's okay to disagree". Pointing out what I said that was wrong, on the other hand, is a strong signal that you were paying close attention to what I was saying, and I'll extend you the same courtesy.
(I guess you could do both and say, "I disagree because you were wrong," but that would seem to defeat your purpose).