Karma in simple words

Don't lie because someone will lie to you.

Don’t harm anyone because someone will harm you.

Do not deceive others because someone will deceived you.

Don't steal because someone will steal from you.

Don't abuse others because someone will abuse you,

Don't talk bad about others because someone will talk bad about you.

Don't think badly of others because someone will think badly of you.

Don’t criticize others because someone will criticize you.

Don’t kill others because someone will kill you.

That’s the significance of the biblical proverb “an eye for an eye and a tooth for a tooth”.

So, try the opposite, like:

Love to be loved

Take care of others so someone can take care of you

So, living a life with altruism and positive actions you will access the kingdom of God, with is just a state of mind and consciousness, becoming one with the Divine.