Where Indo-European languages originated from?

The Aryans or “Noble Ones” were thought to have remained together on the Caucasian steppes from about 4500 BCE until about 2500 BCE when groups began to migrate. Their single language, known by linguists as Proto-Indo-European, evolved into many of the Asiatic and European languages such as Sanskrit, Persian, German, Gaelic, Latin, Greek, Russian, and English. The Indo-European language family has the largest number of speakers of all language families as well as the widest dispersion around the world. Recent ancient DNA studies indicate that the Proto-Indo-European language likely traveled first with the Yamnaya steppe pastoralists when they migrated from the vast grasslands of the Eurasian steppes into Europe around 4,000–3,000 BCE. They were one of the earliest peoples to train horses and to have wheeled carts that allowed them to manage large herds comprising sheep, goats and cattle. Bringing their Corded Ware Complex culture with them, they spoke a language linked to Proto-German, from which all of today’s 400 Indo-European languages spring. They interbred with local Europeans, descendants of local hunter-gatherers and farmers who had come from Anatolia. Within a few hundred years, the Yamnaya contributed to at least half of central Europeans’ genetic ancestry.