Summerize these two theorys Nomatic Warrior Theory, 1st Proto-Indo-European speakers were Kurgan people, Kurgans were nomatic herders, migrated in search for grassland for animals, Kurgan warriors used domesticated horses as weapons and conquered much of Europe and south Asia.
Sedentary Farmer Thesis, 1st speakers of Proto-Indo-European lived 2,000 years before the Kurgans, Indo-European diffused into Europe and South Asia along with agricultural practices rather than by military conquest, and language triumphed because its speakers became more numerous and prosperous by growing their own food instead of relying on hunting