In Buddhist tradition, the idea of karma basically means "You get what you give." It's all about your actions and how you treat people. Whatever you do intentionally to others comes back to you in the future. So if you are kind and generous, then good things will happen to you. On the other hand, if you are mean and insensitive to others, then not-so-good things could happen to you. Buddhists also believe in reincarnation, so the actions of your past lives can affect your present and future lives.
The so-called "Golden Rule" follows this same line of thought: Treat others the way you would like to be treated. So I'm wondering: Do you believe in karma? Do you think that how you treat others affects what comes your way?