Smile

• Language. “Please,” “Thank You,” and “You’re Welcome,” demonstrate to others that you value their effort, thought, and/or generosity.
• Names. Always address others in business by their title (Mr., Mrs., or Ms.) and their last name, unless they request you use a given name or nickname.
• Attire and Dress. The way a person dresses can demonstrate their respect for whoever they are meeting.
• Eye Contact. Most people believe that those who do not make eye contact are lying or avoiding something, or that they lack the confidence to interact effectively with other people.
• Speaking. A clear, well-modulated speaking voice is an important social tool, and contributes to the ease of communication and a good first impression.
• Handshake. While the handshake should be firm, too much pressure shows a desire to dominate and can be a negative signal.

• Be on time.
• Dress appropriately for an occasion.
• Address everyone respectfully, such as by their last name.
• Maintain eye contact, but do not stare.
• Speak clearly, confidently, and do not rush through your thoughts or sentences.
• Offer a firm handshake.

• Avoid discussing politics and religion as many people have strong feelings about these topics and if your opinion differs from theirs, an unpleasant argument could ensue.
• Tasteless jokes, especially those which target a specific gender, cultural group or sensitive topic, are not funny and may create legal difficulties for you and your employer.
• Never bad mouth a current or past employer, or engage in malicious gossip about co-workers. 

Behavior which might be considered acceptable or even unimpeachable in the U.S. may be considered offensive by people with different social rules.