Here are 20 "do nots" from the Bhagavad Gita, listed in order of importance:
Do not be attached to the fruits of your actions.
Do not engage in selfish actions.
Do not be motivated by desire.
Do not be influenced by the dualities of pleasure and pain, success and failure.
Do not be attached to material possessions.
Do not let anger control you.
Do not be deluded by pride.
Do not be attached to the physical body.
Do not be controlled by the senses.
Do not be attached to your family or friends.
Do not be attached to worldly pleasures.
Do not be attached to wealth or power.
Do not be attached to your own opinions.
Do not be attached to your own abilities or achievements.
Do not be attached to praise or blame.
Do not be attached to past or future.
Do not be attached to rituals or traditions.
Do not be attached to sense objects.
Do not be attached to the idea of being the doer of actions.
Do not be attached to any particular outcome.