What is karma ? | How karma works?

Nothing happens by chance by fate. You create your actions. That's karma

What does karma means ?

A simple definition of karma

Karma means action, work or deed, it also refers to the spiritual principal cause and effect where intent and actions of an individual (cause) influence the future of that individual (effect) 

So, now what does it mean 

let's take an example, 

"A boomerang returns back to the person that throws it "

That is karma 

If you do good then it will be good with you if you do bad with someone it will be bad with you

How karma works ?

Wilhelm halbfass explains karma by contrasting it with another Sanskrit word kriya the word kriya is the activity along with the steps and efforts, while karma 

1. The executed action as a consequence of that activity, as well as 
2. The intention of the actor behind an executed action or a planned action ( described by some scholars as metaphysical residue left in the actor).A good action creates good , karma as does good intent, as does bad intent.

Now as a man is like this or like that, according as he acts and according as he behaves, so will he be; a man of good acts will become good, a man of bad acts, bad; he becomes pure by pure deeds, bad by bad deeds. And here they say that a person consists of desires, and as is his desire, so is his will and as is his will so, is his deed and whatever deed he does that he will reap. ~Brihadaranyaka, Upanishad

When a bird is alive it eats ants. When the bird had died, ants eat it. One tree can be made into a million matchsticks, but only one matchstick is needed to burn a million trees. Circumstances can change at anytime. Don't devalue or hurt anyone in this life. You may be powerful today but time is more powerful than you so be good and do good

• As a man himself focus , so he himself reaps,no man inherits the good or evil act of another man, the fruit is of the same quality as the action. 

Happiness comes due to good actions suffering results from evil actions, by actions all things are obtained by inaction, nothing whatsoever is enjoyed

If one's action bore no fruit, then everything would be of no avail, if the world worked from fate alone, it would be neutralised 

•  The most important and factual law of karma, this is something you need to keep in mind while taking important decisions in your life for instances, say today you don't respect your parents.

•  But it will come back to you when your own kids don't respect you in the future. It's karma it works like a boomerang, so if you want to be happy gain respect and live in peace you need to spread happiness respect others and be peaceful.

Everything that you have done till now is karma. All that you are doing at present is also karma and everything that you are going to do in future or the inspiration for every that you are going to do in the future that is also karma, everything that is happening in the world is karma. ~ Shri Shri Ravi Shankar

Stress will kill you as fast as bullet. Find your peace and live there.