Upanishads
Upanishads (700 BC) are texts that contain the philosophical essence of the Vedas. The philosophy of the Upanishads is called Vedanta and is studied even today. Some of the popular Upanishads are the Isavasya, Kena, Mundaka and Katha Upanishads. There are 108 Upanishads in all. Some authorities classify the Upanishads as Sruti.
Vedangas
To this category belong several texts like the Ayurveda (science of life and health), Dhanurveda (science of war), Gandharva veda (science of music), Arthshastra (science of polity and governance), Dharmashastras (laws) and several other subjects such as phonetics, grammar, astrology and astronomy, to name a few, are covered by the Vedangas.
Darshanas
Six metaphysical systems called Darshanas were compiled immediately before and after the time of Christ. These are theological texts meant for erudite scholars.
Itihasas
The Itihasas include great Hindu epics like the Ramayana (700–500 BC) and the Mahabharata (400 BC) besides other texts. Believed to have been narrated by renowned sages, these epics are complete social, moral and philosophical treatises. The Itihasas aim at imparting values of life and living through narratives.
The popular Bhagavad Gita (the Song of the Lord) is a part of the Mahabharata. What makes the Bhagavad Gita special is that its philosophy is relevant to mankind even today.
The Ramayana eulogizes Lord Rama and the Mahabharata Lord Krishna – both avatars of Lord Vishnu.
Puranas
Several mythological texts such as the Vishnu Purana, Shiva Purana, Garuda Purana and the like talk about the various gods in the Hindu pantheon. There are eighteen Mahapuranas (great texts) and a few smaller ones too. These texts were meant for those who could not understand the Vedas. They impart the same teachings in a different flavor. All the Puranas talk about the Hindu trinity – Brahma, Vishnu and Shiva, and their consorts
The Bhagavata Purana chronicles the various avatars of Lord Vishnu.
Agamas
The Agamas (6th–12th centuries AD) detail the methods of temple construction and the methodology for ritual worship. Three main divisions in the Agamas cover the three main divisions in Hinduism – Vaishnavism, Shaivism and the Shakti cult. These are followed even today.
Texts in other languages
As practicing Hindus lost their mastery over Sanskrit, texts in regional languages like the Tevaram and Divya Prabandam, and Ramayana in regional languages became popular.
The sheer number of Hindu sacred texts may seem a bit overwhelming. There is, however, an order to these texts and an unquestionable purpose to their existence. Each text has the potential to liberate a person and put him on the path to moksha – spiritual liberation, the goal of human existence. Ancient seers have truly ensured that suitable means are available for spiritual needs of all levels.