In the Paleolithic Age (2.5 million CE), Homo Habilis' taught themselves how to create simple tools from lava rock and stone. The system of having Hunters and Gatherers made survival easier because they could work together to have a supply of food and plants.
Neanderthals created more stone tools, cave shelters, clothing, practiced religion, made fires, and cooked their food. The Cro-Magnons learned that spear throwing could help them catch food easier and they started cave drawings.
In the Mesolithic Era (10,000 CE), early humans used fishing spears and fishing hooks to make catching fish easier. They also used harpoons, canoes, bone tools, and bow and arrows to help survive.
In addition to these advancements, early humans in the Mesolithic Age started to domesticate animals for hunting purposes. This was very helpful because the animals could help hunt for food they need.
A big accomplishment in the Neolithic Age (9,000CE to 3,000 CE) was having permanent settlements because humans migrated a lot and when they stayed in one area for a while, their shelter was in a cave or temporary shelters. Due to the permanent settlements, small villages were created and continued to grow.
Agriculture improved greatly by the Neolithic Age which allowed people to learn other skills such as trading and crafting raw materials. People started to domesticate animals for the purpose of having a constant food source. Because there was a surplus of food and materials, there was enough to feed the people and trade goods. The growth of farming produced more food, which fed more people and increased the population.