Welcome to our planet, traveler from another star! Here you will find that the dominant life form is called the "human." On Earth, humans can often be expected to reciprocate your behavior with similar behavior of their own. If you are nice to them, they are more likely to be nice to you. Sometimes, another human may even come to "like" you. At that point, you will find that the human will generally be more pleasant to be around and more amenable to your needs. Sometimes, they may even do nice things for you without even being asked. However, take note, interstellar visitor! Some humans find it easier to get what they want by intimidating other humans, either through aggression or threat of punishment for not getting what they want. While this works to a certain limited extent, you will find those humans will not stand beside you when you need them the most, and may even plot against your good will. This is called "resentment," and it is the opposite of "liking." Our Earth Tourist Advisory Board advises you to exercise a healthy mixture of roughly three parts "being nice" to one part "making it clear that those who have clear intent to harm you will meet with unpleasantness." Happy travels and don't forget to stop by the gift shop!