What is forbidden in Sanatan Dharm?

One can say nothing is forbidden because everything is under maya. Although being influenced by maya one still to do their dharm duty and this has to be done until you attain moksh. Hinduism is called Sanatan Dharm which means eaternal religion(dharm). This means, one cannot lie, cheat, kill animals for food, kill people, disrespect women, commit adultery, drink alcohol etc…. so one has follow the common theme that is promoted by studying the main teachings of Hinduism. The message is clear as it is repeated in many parts of the vedic scriptures. Ahinsa Parmo Dharm which means the highest duty for a Hindu is to practice and live by principle of Ahinsa which is non-violence. Anything that goes again this principle can be said is against your dharmic nature and purpose of life.