Karma is not properly understood. Karma means action or motion within oneness. All action or motion emerged from one and is contained within one, just like all waves not only emerged from— but are the same sea. Hence, "emotion," for example, means one's motion, since "e" as in "energy" equates to "one" (en/ein/un/uno = one).
When it comes to understanding motion, action, or karma, we must consider what precedes karma. Before karma is (not was since time is relative in the absolute sense) kama, without an "r." Kama has two meanings: it means desire and it means love. Essentially, kama represents the desire for love (or to love and be loved). This desire for love leads to action or motion.
A takeaway from a holistic perspective? Although all is still one, there is differentiation within oneness for companionship, or, as a romantic says, love.
~ Wald Wassermann