Theory:

Do you know from where our ancestors or we came from? We came from the species of “Homo sapiens”.
Human Evolution and Migration 
Great Apes are known as the Orangutans, gorillas, chimpanzees, and humans. From these, genetically closest to the human is the chimpanzee.
 
“Hominins” is considered as the human being’s ancestor. Hominins evolution has progressed from Africa. From there, they moved to the rest of the world around 7-5 million years ago. The Skeleton and bones of Australopithecus, the earliest human species, had been discovered in many places in the Great Rift Valley of Africa.
 
The Great Rift Valley is a series of adjoining geographic trenches which runs close to 6400 km. The Great Rift Valley runs from the northern part of Syria to Central Mozambique in East Africa. One can see the great valley from space.
 
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The Great Rift Valley of Africa
 
Our ancestors are classified into different species based on their physical characteristics.
 
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Hominids - Refers to human and all the modern and extinct species of Apes.
 
Hominins: A zoological tribe close relative to our ancestor and their sister species, including the present state of the humans known as Homo sapiens, and the extinct members of Homo neanderthalensis, Homo erectus, Homo habilis and various species of Australopithecines. Among this tribe’s list, the only living species is ‘Human’. They have large brains, stand upright, walking with two legs. Few of them were able to communicate with each other. And, they also used Microliths.
Homo habilis: The oldest human ancestor lived in Africa 2.6 million years ago. They were also known as “Handy Human”. Among the other tribes, they were the first ones who made stone tools.
 
Homo erectus/ergaster: Two million years ago, this species came into existence. They made the hand axes between 2 million to 1 million years ago. During this time, they started to spread across the continents of Asia and Africa.
 
Homo sapiens also known as the wise man (Modern Human), lived in Africa around 3 million years ago. Later on, around 60 thousand years ago, they moved away from Africa and settled down in different parts of the earth.
 
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Lucy Skeleton
 
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Lucy skeleton reconstruction at the Cleveland Museum of Natural History
Reference:
https://www.arcgis.com/sharing/rest/content/items/52910977b1684a348a350bc1c78394ce/resources/1573758034259.png?w=600
https://cdn.britannica.com/36/79536-050-BE1C475B/human-lineage-hominins-members-lineages-apes-interpretations.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Reconstruction_of_the_fossil_skeleton_of_%22Lucy%22_the_Australopithecus_afarensis.jpg/220px-Reconstruction_of_the_fossil_skeleton_of_%22Lucy%22_the_Australopithecus_afarensis.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/d/da/Lucy_Skeleton.jpg/399px-Lucy_Skeleton.jpg