Now that you understand what the 7 hermetic principles are and the principle of polarity, it will be easier to understand Green Tara’s take on Karma. Because she uses these two concepts in her channeled message. Here is an excerpt where she explains Karma (read it till the end because it gets interesting later):

Karma, as you know, is action – whatever actions you take that make you feel obligated to come back and finish what you started. So when souls are born, as you know, according to the seven hermetic principles, they experience one ‘side’ of a life theme (read principles of polarity – two opposite sides of the same theme as shown in the pic below), they would also like to experience the other end (opposite side) of the theme. Some people do that in the same lifetime. Some people don’t experience that in the same lifetime, but in different lifetimes through different depths and varieties.

Unlike what you have been told that hurtful action generates negative karma, and positive actions generate positive karma that is not true. The effect of character building (i.e. exhibiting traits like honesty, integrity, generosity, loving-kindness, consistency, and moderation) is mostly to experience a harmonious period when you are on Earth. Your karma is defined by what you wish to experience before birth, what you experience on Earth, and what you choose to experience later. People are allowed to do whatever they wish to do in their lifetime. Healing yourself emotionally & physically (including your traumas) allows you to live a happier life here and allow others to live a happier life here so that the suffering ends. Trauma healing has everything to do to end the suffering. The golden age or dark age has no impact on anyone except for humans (and living beings) for this reason. The universe is neutral. 

The universe is okay with whatever age or cycle you are going through because for the universe (for God or whatever you wish to call it) everything is important. So ‘contractions’ and ‘expansions’ are part of the process (contractions = devolution or depression/darkness. Expansions = lightness, growth, spiritual ascension). Positive energies allow you to vibrate higher negative energies make you vibrate lower, and experience more suffering. So the whole point of expansion is to vibrate higher become lighter, and experience more ascension to the next level. But remember that all phases are important – as you already know contraction is as important as expansion. Because things are cyclical in nature. 

There is no motivation to create expansion if there is no contraction. So the desire for expansion comes from contraction. The desire to expand even further causes contraction. Because when you have expanded to a certain degree, you realize that in order to expand, even further, faster, you need to go through a period of contractions. When a soul becomes expanded, it realizes that it can expand even faster by understanding the contractions, because that will take it to new heights, new areas that it hasn’t experienced yet. So all expansions are motivated by contractions and all contractions are motivated by expansions – to expand further, to expand faster in different directions in different dimensions, in different growth cycles. Contraction is never underestimated. It’s part of the cycle and is part of the theme. 

So you can completely ignore the concept of Karma. Don’t make yourself heavy with what you did in the past lifetime or how your actions will be judged in this lifetime. Everybody has free will to do whatever they wish. 
Which is what people are doing, and that is not making them happy. Because there are certain laws to experience happiness – the more you expand the more you feel happy. The law is simple.

The concept of karma is an indirect way of controlling people. It’s the same concept the Western religion had created with heaven and hell. In Eastern religions it was karma – to keep people on their toes and to practice virtues. But you cannot scare and shame people into being virtuous. So you can ignore karma. It has been misused a lot. 

The purpose of the virtues – honesty, integrity, character development, accurate perceptions, and things like that clear up your aura. Those are manifestations of how clear you are to yourself, and how much you love and accept yourself. So those are reflections of how developed you are. When you have traumas, you will not be able to be those things because of fear. So when you heal your traumas, you will become the most authentic version of yourself.

So those virtues, you could say, are checkpoints to tell you that you have become more authentic to yourself. You are able to draw boundaries clearly without hurting others. You are able to become compassionate towards others, selfless in giving, and yet also take care of your own interests without sacrificing yourself. You are able to establish a harmonious relationship with others without giving up your own mental peace, which creates a happier collaboration with others and greater satisfaction in your life. So those are markers for how much you have healed yourself, loved yourself, and how close you are to ascension because when you are able to live and embody those virtues, it means you have greatly worked on your traumas and your limiting beliefs.
You have moved to a state of power that you are not afraid to live your highest expression on Earth in a way that you desire.

I would not say that there are no laws of karma. I would say just ignore that. That is not relevant to the themes that you are going through. Don’t let the past influence your present or the future. Let go of anything that shames you and binds you to do something that is not YOU. The more you are expressing yourself as authentically and honestly as you can be to yourself, the more you are raising your vibration.