Summarize:

When first meeting or greeting someone, offer them up a warm smile.  Smiling indicates that you are in good spirits and are happy to see them.  It helps to establish friendliness from the get-go as the smile is the first impression that people usually make when meeting someone. In some cultures, such as Russia, smiling is not necessary. Instead of just walking by someone you know or ignoring someone you are supposed to be meeting, greet them with a warm ‘hello.’  You do not need to wait for them to say it to you first; it’s okay to be the initiator. For example, “Hello, Mr. Sanderson. It’s great to meet you! My name is Emma Payne and I work in cybersecurity.” firmly and assertively.  When meeting someone, take their hand into your right hand and grasp it firmly, shaking it up and down once. Respect the other person by not squeezing their hand too hard in an attempt to "dominate" them. If you know them well, you might hug instead.  There are many different ways people around the world greet each other, and these greetings may not always involve handshaking. Be sure you’re aware what’s appropriate in the country you’re living in. You can go online to find out if you’re unsure. When in conversation with someone, look them in the eyes a little over half the time you’re speaking. Maintaining eye contact shows that you are paying attention. Staring at them, however, can be perceived as creepy and rude. Break eye contact every so often to avoid staring.   Eye contact is usually seen as a sign of respect in Western culture. In some Eastern cultures, it can be seen as a sign of aggression. Don't make eye contact if the other person considers it rude. People with certain conditions such as autism and social anxiety may find eye contact unnerving or distracting. If eye contact is hard for you, you can fake it by looking at someone's nose or chin. (They usually can't tell the difference.) If your conversation partner avoids eye contact, keep in mind that they may be shy or they may have a disability, and let it go.
Smile when greeting someone. Say hello. Shake hands Make eye contact if it is culturally appropriate.