In Paleolithic times, humans constantly moved and didn't have proper shelter. They lived in temporary shelters, like caves.
I have an idea! Since we walk for so long and our feet start to hurt, why don't we just cut off our feet? That way, we can walk and not feel any pain!
Yes, I'm sure that'll work.
In Neolithic times, however, people had houses and proper shelter. They stayed in one place and didn't move around a lot.
Hello? Anybody home?
This was important because if humans had simply kept wandering around, they would have eventually died off and had a hard life. Also, these changes were important because humans could grow bigger communities and could focus on things other than surviving, like beauty products and trading.