When you really stop to think about humanity and it's past, it's crazy how far we've come in only a short amount of time, at least that's according to our recorded history, but what about before history? when nobody was recording important events in humanity's existence.
As it turns out, we still no surprisingly little about the first humans to walk the earth, other than that there were six other kinds of humans at first but for unknown reasons they all died out and we're the only ones that survived.
From that point onwards we're able to determine when early humans discovered fire, grouped together and formed communities and began to found civilisation. Checkout this awesome video from Kurzgesagt that explains it all with brilliant animations.