It is very difficult to give an exact answer to this question. Since ancient times, mankind has known several metals that are found in a native state. Of the precious ones, these were gold and silver, which was more expensive in antiquity. Of the more widespread – copper and tin, which gave bronze in the alloy. It was she who preceded the gland, the manifestations of which are rare in nuggets. Obviously, someone in one of the centers of civilizations was the first to melt a nugget of something from a row: gold, silver, copper, tin.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.