Explanation: Karma is when you die it will determine if you are going to go to be reborn or not, Dharma is a persons duty, reincarnated is going one life to the next and caste is how they dived there people starting off with Brahmins which are the priest, teachers(grus) then the Kshatriya which were the warriors ,rulers then the Vaishyas which were the merchants and landowners. Then the Sudras which were just servants then at the VERY bottom was the untouchable's which had the WORST jobs that the uppercases people didn't want such as cleaning the streets etc.
I hope this helps I just used my notes from last year lol.