The explanation of karma can differ per tradition. Usually it is believed to be a sum of all that an individual has done, is currently doing and will do. Karma is not about retribution, vengeance, punishment or reward; karma simply deals with what is. The effects of all deeds actively create past, present and future experiences, thus making one responsible for one's own life, and the pain and joy it brings to others. In religions that incorporate reincarnation, karma extends through one's present life and all past and future lives as well. It is cumulative. Karma is a force of nature and not a sentient creature capable of making value judgments, karma isn't about good and evil deeds, because applying those labels would be judgmental, but that it is about positive and negative energy, where negative energy can include things not seen as "being bad" like sadness and fear, and positive energy can be caused by being creative and solving problems as well as by exuding love and doing virtuous acts. At some point as people we need a "code" or "rule" book to live by even if it is the Wiccan Reed, Code of the Samurai, The Golden Rule, or something else you follow that makes you a "better" person to live with in society. Find that place that is true for you, makes you happy, makes others happy and helps contribute to the world around you in a positive note.
Bushido
The Samurai code of chivalry known as Kyuba no michi ("The Way of Horse and Bow") later changed to the Bushido ("Way of the Warrior") code. It was at the heart of the beliefs and conduct of the Samurai. The philosophy of Bushido is "freedom from fear." It meant that the Samurai transcended his fear of death. That gave him the peace and power to serve his master faithfully and loyally and die well if necessary. "Duty" is a primary philosophy of the Samurai.

In my case my "master" is myself and my "duty" is to the world around me.
James McDonald
Ammon AkerBushidou
Justice (Gi)
1. the quality of being just; righteousness, equitableness, or moral rightness: to uphold the justice of a cause.2. rightfulness or lawfulness, as of a claim or title; justness of ground or reason: to complain with justice.3. the moral principle determining just conduct.4. conformity to this principle, as manifested in conduct; just conduct, dealing, or treatment.5. the administering of deserved punishment or reward
I try and do things that are found morally right in societies eyes.
Bravery (Yuu)
1. brave spirit or conduct; courage; valor.2. showiness; splendor; magnificence.
I try and be brave in standing up for myself and do what is right even when it is not easy to do.
Benevolence (Jin)
1. desire to do good to others; goodwill; charitableness: to be filled with benevolence toward one's fellow creatures.2. an act of kindness; a charitable gift.
I try to contribute to the world around be by being kind to others and the world itself.
Politeness (Rei)
1. showing good manners toward others, as in behavior, speech, etc.; courteous; civil: a polite reply.2. refined or cultured: polite society.3. of a refined or elegant kind: polite learning.
I try in today’s society to have good manners and be courteous to all.
Veracity (Makoto)
1. habitual observance of truth in speech or statement; truthfulness: He was not noted for his veracity.2. conformity to truth or fact; accuracy: to question the veracity of his account.3. correctness or accuracy, as of the senses or of a scientific instrument.4. something veracious; a truth.
I try to always speak the truth to others for my word is something I hold very important.
Honor (Meiyo)
1. honesty, fairness, or integrity in one's beliefs and actions: a man of honor.2. a source of credit or distinction: to be an honor to one's family.3. high respect, as for worth, merit, or rank: to be held in honor.4. such respect manifested: a memorial in honor of the dead.5. high public esteem; fame; glory
I try to keep my word and stay true to my actions and promises.
Loyalty (Chuugi)
1. the state or quality of being loyal; faithfulness to commitments or obligations.2. faithful adherence to a sovereign, government, leader, cause, etc.
I try to be faithful to myself, my beliefs, family and friends in all I do.