What is the importance of dharma hindus?

* Karma.

Similar to "What goes around, comes around."

* Ahimsa.

No battles, unless it's about self defense.

* Nature respect.

No animal killings, no non-veg either.

* Afterlife.

You re-incarnate to other life, or into heaven/hell as per your deeds.

These are the few points, about the endless Sanatana Dharma(Hinduism).