brahman, khattri, vaish and shoodr
good question.
social institution includes religion,family,politics, and economic.
About 4.
Because the main foundation of Hinduism is based on 4 Vedas. Which teach a man Truthfulness (satyam) as an essential part of his lifestyle.
Every 2 Or 4 Years
Quadrivium (apex)
The 4 position is the powerforward.
Karma, arth, gyan, moksh
The four main groups in the 1500s wereGentlemenCitizensYeomenLabourers
there are 4 main divisions- social, cultural, linguistics and archaeology (which is normally studied as a separate subject) hope I helped.
Hindus have many deities. But what I think you are referring to is, Brahma, the creator, Vishnu, the maintainer, and Shiva, the destroyer . These three form the trimurti. The fourth is Durga, the goddess who is the invincible.
The four things that Hindus generally do while pooja are Haarathi, Naivedyam, breaking a coconut and giving flowers to god. Everyone of these has its own meaning.