Kamma is an ACTION.
It's done NOW.In the PRESENT.Not the past.
Everytime you hear someone say that's my kamma,that's why i'm poor
.That's wrong.Your kamma is now
.What your doing about your current situation.That's you kamma.Right here in the present.
Your poor because of the RESULT
of your past kamma not your present kamma.You can still do something about it.
That's two different things.What you did in the past and what you do now are two different things.They might be related but they are different.
Right Now your Kamma is made up of:
1.The fruit of your past kamma.(Past result)
2.Your present kamma,free will,or intention.(Present action)
of your present free,will,kamma or intention.(Present result)
These three things are combined and adjust themselves to each other
,they work together continuously in an intricate manner..so precise that it's impossible to really take it apart and study it completely, bit by bit.
Saying if i did this than that person will do this,will get you nowhere.
I mean you can see the general outline but to really break it down and allocate whose faults it belongs to and try to trace it back is not fruitful. One of the reasons being Kamma is a very impersonal process.Kamma doesn't recognize you
. Kamma deals only with action and reaction.Just like the law gravity ,if you push someone off a building,gravities not going to care who died or who did it.Every object in it's path will always have a tendency to fall.
Kamma is also a very complex and intricate process.One of the reasons why you will give yourself a headache if you try to break it down specifically.
Always know that Kamma is made up of both past actions and free will.Your past kamma shapes your present state and your present kamma shapes your future state.
For example, if you killed someone and then felt remorse,practiced meditation to make good present kamma,then that good kamma can neutralize you past unwholesome kamma,so in the future instead of getting killed you might just get beaten up pretty badly by some random drunk etc.this all depends on how much good kamma you have.but the act of killing is pretty heavy,it's one of those kamma's that can carry a lot of weight, so i think you would experience it's consequences to differing heights.I doubt you'd get off of it easy.Murdering your parents is an almost no go zone.I think even after you gained enlightenment you's still have to experience the results of it.If this is the case then one should practice equanimity.
If it were something lighter like if you stoled something,then you did a lot of dana or generosity then it might get neutralized.Maybe you'll still have someone steal your money,maybe you will just feel cheated off on a deal or maybe you'll have completely neutralized it and not experience it's results.
It all depends on a zillion little factors that is extremely difficult to trace,measure or calculate accurately.This is why Kamma is so Powerful.Not only can it do all that but it can go through infinite aeons before we actually experience the results of a particular kamma.
Physics and other natural laws also affects other aspects of our existence .But Kamma in itself
is VERY COMPLEX
and depends on a lot of factors CONCERNING solely
our actions/intentions. Kamma takes into considerations every small detail,from the most minute thoughts and intentions that can affect our kammic results.
So to be safe just keep it simple and follow the main guidelines:
1.Every Action has an opposite or equal reaction.
2.If you do good good things will come to you.
3.If you do bad bad things will come to you.
if you stick to that then you will change the course of your life and will be headed towards a better place.