what is the law of karma taught by the Upanishads
The following points may help you:
a. Upanishads are the philosophical texts of Hindu religion whose main principles centre around the idea of karma.
b. It identifies Karma or deeds as a principle of cause and effect based on actions.
c. It believes in the cycle of death and rebirth based on past actions.
d. It is your karma in the previous life that determines your condition in your present life.
e. Upnashids consider karma as the fundamental law of nature.