Firstly, the law of karma is All living creatures are responsible for their karma — their actions and the effects of their actions — and for their release from reincarnation.
In short, it is some concept where you did something wrong and bad.
So, killing of living things give you karma, racist jokes give karma and cheating also give karma.
I will go in deep into the killing of livings things. Firstly, we loves to eat meat. This means animal being kill which equals to karma. We drink water - which contains microscopic organism - and drinking it down means killing them too. Vegetarians also gain karma by eating vegetables. So, no matter what we do we still gain karma. Hence in conclusion, we confirm have karma. So do what makes you happy. Chiu happy can riao!