Dharma was belief in law, obligation, and duty. Each Hindu was born into a class and each class had its own Dharma. If every Hindu followed this rule, there would be harmony in their society.
Karma explains the importance of life. Hindus believed that Karma can affect them in the afterlife based on what they do in life. If they do bad they will get punished, if they do good, they will get rewarded.
Samsara is the life cycle of birth, death, and rebirth. When a soul escapes from rebirth, they unite with Brahmins. In order for Hindus to connect with Braman they have to go on a holy journey called pilgrimage. This would remove them from any sins.
In conclusion, Hinduism was the first major religion in India. Its five beliefs, Brahman, Deities, Dharma, Karma, and Samsara, are an essential part in this religon. Brahman are the supreme power of the universe, Deities are the faces of Brahmin, Dharma was the law, obligation, and duty, Karma explains the importance of living by dharma, and Samsara is the cycle of birth, death, and rebirth.