Who were the Yamnaya people and what is the Steppe Hypothesis?

by AlvinYork328

after viewing the question by /u/monkey_paralysed, I tried researching the question I posted above and was overwhelmed by the depth of the response. I am hoping someone here may be able to put the above question into proper context for someone who has very little familiarity with Bronze Age history.

Searocksandtrees

after viewing the question by /u/monkey_paralysed

For reference, the post in question is: Has ancient DNA settled the Indo-European question in favour of the Steppe hypothesis? If so, were the Yamnaya peaceful migrants or conquerors?, which is unanswered so far. It was also x-posted to /r/AskAnthropology, also unanswered so far.