Reddit karma is a user score that represents how much value a user has added to the Reddit community, calculated by adding up post karma, comment karma, awardee karma, and awarder karma. To get more karma on Reddit, users must follow subreddit rules, participate in larger subreddits, have genuine interactions, post at the right time, comment on new and rising posts, respond to comments, post good content, repurpose helpful and meaningful content, and tread carefully with promoted posts. Building trust and connections is key to earning karma, as redditors are wary of promotional content and prefer users who show their human side. By following these guidelines, individuals and businesses can increase their visibility on Reddit and build a loyal community of followers.