Can someone correct my grammar, and punctantions?

I strongly believe in what goes around comes around. This is a quote which means that whatever you do in this life to other people, whether it is good or bad, the same will return to you. It is making decisions how you treat people will have an impact on how you will be treated someday. If you are good and kind to people they will treat you kind in return, but if you are mean, and cruel to people and make bad choices in your life, then people in your life will not be so kind to you. The term what goes around comes around is also, means karma.

Karma is the Hinduism and Buddhism belief that the force generated by a person’s actions perpetuates transmigration and in it has ethical consequences to determine the nature of the person's next existence.

Karma means action, work or deed.  It also refers to the principle of causality (is the relation between an event that is thecause and a second event is the effect, where the second event is the consequence of the first), and the intent and actions of an individual influence the future of that individual. People who have Good intent and who done good deed contribute to the good karma; which they will have  a future of happiness, while bad intent and bad deed contribute to bad karma, which a person can expect to have future suffering.

I strongly disagree with the term, hard work always pays off. The term, hard work always pays off, means nothing in this world is was handed to you, and you earned your key, due to hard work perseverance. I believe in some case that hard work pays off for some, but in most case, in my opinion, people who work hard are always overlooked and always treated like crap, and they don’t get their dues.