Here are my favorite communication tips:
Smile more. It's amazing how much you'll benefit from that easy, superficial change: People will like you more, and you'll be more relaxed.
Put yourself in the shoes of the listener. Would what you're about to say elicit the desired effect?
Tip for establishing eye contact: What's his eye color? Does her eye area look kind or mean? Eyes are a window to one's soul.
To build connection, your responses should move toward the person: a clarifying question, supportive example, even playful teasing.
Keep your utterances to 45 seconds or less, then ask a question or shut up--No need to fill the silence.
In most conversations, talk a bit less than 50% of the time. More than that, you risk being viewed as egotistical, a blowhard, or too chatty.
Don't confuse tact with timidity. Sometimes boldness is required.
Even if you need a lot from a person, perhaps ask for just a small piece. That cuts the risk of overwhelming the person and getting a "No."
"The first thing a man will do for his ideals is lie." Joseph Schumpeter, eminent 20th century political scientist and economist.
Secure people will accept and maybe even appreciate constructive criticism, but everyone loves earned praise, especially about something they feel insecure about.
When interviewed or giving a talk, you may be tempted to use a script. Don't! It leaches the crucial chemistry.