Netiquette provides guidelines for polite and appropriate online behavior. The core rules include remembering the human on the other side, behaving online as you would in real life, and knowing where you are in cyberspace. Specific guidelines include respecting others' time, making a good impression, sharing expertise, avoiding flame wars, respecting privacy, not abusing power, and being forgiving of mistakes. Netiquette aims to promote effective and respectful communication online.