Important terms to understand Moksha
Atma ( Soul)
The Atma is our true self. Whatever is happening outside in the material world, does not belong to Atma.
In Geeta's Book, Krishna is saying about Atma to Arjuna:
नैनं छिन्दन्ति शस्त्राणि नैनं दहति पावकः।
न चैनं क्लेदयन्त्यापो न शोषयति मारुतः॥
Source – Shrimad Bhagavad Gita 2nd Chapter, Verse 23
nainam chindanti shastrani, nainam dahati pavaka
na cainam kledayantyapo, na sosayati marutah.
nainaṃ chindanti śastrāṇi nainaṃ dahati pāvakaḥ
na cainaṃ kledayantyāpo na śoṣayati mārutaḥ
na—not; enam—this soul; chhindanti—shred; śhastrāṇi—weapons; na—nor; enam—this soul; dahati—burns; pāvakaḥ—fire; na—not; cha—and; enam—this soul; kledayanti—moisten; āpaḥ—water; na—nor; śhoṣhayati—dry; mārutaḥ—wind
Weapons cannot shred the soul, nor can fire burn it.
Water cannot wet it, nor can the wind dry it.
आत्मा को न शस्त्र द्वारा काटा जा सकता है, न नहीं आग द्वारा जलाया जा सकता है,
न ही जल इसे गला सकता है और ना ही वायु इसे सूखा सकती है।
Jivatma (Layer of Soul)
Jiva Atma is layer of soul. Jivatma comes from 2 words: Jiva means Human being (anyone that has a soul) and Atma means soul. Just because Atma is immortal, so you may be wondering someday how Atma will be punished by Yamraj if Atma is beyond this material world and not involved in these illusions of the world. The creator has made the layer of soul which is attached to Jiva and the Atma at the same time. This layer is made for self-realization.
Mrityu is the death. Death is complete rest. The complete rest from the world's illusions and drama. Death is not the end of life. This a new beginning for the journey of the soul. Death is the major truth of life. No Matter if someone is a king or a beggar will die one day. The question "What is death", changed the life of Buddha and he got knowledge. To explore why we die is self-realisation.
Panch Prana (5 Life forces)
Prana is life force. We also consider Prana as Vayu. Vayu is our life force. Prana is directly related to our awareness, if our prana vayu is very relaxing and smooth, we will be calm. On the opposite, if we have anger, we will breathe fast or uncommonly.
There are 5 Prana as follows:
Antyeshti Kriya (The last ceremony)
Antyeshti Kriya is the last ceremony. It is the ceremony before Dah Sanskar ( Cremation). Antyeshti Kriya is the most important ceremony according to ancient books such as Garuda Purana. One can only get the liberation of his Antyeshti Kriya done properly. Humans feel the energy of good people and bad people, good people definitely have some well-wishers who can do after-death ceremonies if they have no parents or siblings.
Dah Sanskar (Funeral)
Dah Sanskar is simply the funeral in Agni (fire) element. The word Dah simply means Burn. After the Antyeshti Kriya, Dah Sanskar is the last visible existence of humans. The body slowly and beautifully dissolves into the fire. In some cultures, they believe to merge in the earth but Hindus and Sanatani believe that we came from fire. The truth is that we came from fire. When the mother and father merge with each other and generate fire, it is the creation of a child.
Shava (Dead Body)
The Shava is a dead body that has no prana. Once all the Panch Prana (5 Vayu) leaves the body, it converts n Shava. The word Shavasna is also called corpse pose because the word shava means corpse. Shava does not have a mind and soul. Shava is the self-realization that all will leave you one day even if your own mind and soul.
Samadhi is the state of pure bliss and happiness. It is the one major aim and dream of every human. Samadhi is not moksha. Every human that gets Samadhi may have many chances to Moksha but the person who gets Moksha may not get Samadhi. Samadhi is called Enlightenment which is real and rare.