What a strange question. Might as well ask how a fish learned to swim or a bird to fly. In all seriousness the biggest influence likely comes from friendly and

What a strange question. Might as well ask how a fish learned to swim or a bird to fly. In all seriousness the biggest influence likely comes from friendly and enthusiastic teachers and a then all the things necessary to support having enough time to sit and think. Strong and true autodidacts are few and far between in the general population. And even then it's a very rare one that can not only describe their internal state let alone allow its transmission to others.