Upanishad

The Sanskrit term Upaniṣad from upa “by” and ni-ṣad “sit down” means “sitting down near”, referring to the student sitting down near the teacher while receiving spiritual knowledge.(Gurumukh)

They are the part of the oldest scriptures of Hinduism, the Vedas, that deal with meditation, philosophy, and spiritual knowledge; other parts of the Vedas deal with mantras, benedictions, rituals, ceremonies, and sacrifices.
Our world is based on some specific things. It evolution, growth and timely changes depends of certain rules which is call as Religion.

The road and how you can reach the moksha is mentioned and written by saints in Upanishads.

The Upanishads are commonly referred to as Vedānta Ved means Knowledge and last point of this knowledge is Upanishads.

There are prominent 8 Upanishads which we are going to study.

Veda Mukhya
Rigveda Aitareya
Samaveda Kena
Krishna Yajurveda Taittiriya, Katha
Shukla Yajurveda Īśa
Atharvaveda Muṇḍaka, Māṇḍūkya, Praśna