What was the first thing that was build?

The first thing built by humans is often considered to be simple stone tools, dating back to around 2.5 million years ago. These early tools, such as hand axes and choppers, marked the beginning of technological development. As societies evolved, the first built structures were likely temporary shelters made from natural materials. Over time, more complex constructions, like permanent dwellings and communal structures, emerged as human societies progressed.