The nature of a human is to improve his life, to prosper, to attain subjective goals. Humans choose various ends as their goals and use various means to attain ends.
Humans enjoy the attainment of ends. Ends are most always achieved through action, though sometimes ends obtain through the independent actions of others. It is this enjoyment and its pursuit which defines the nature of humans.
Prosperity of human children depends largely on gifts received from their parents and other adults. Once a child grows into adulthood, his prosperity is mostly determined by his resources and abilities.
Humans think and act. You can’t tell for sure what a human thinks, but you can surely see his action. Human action is observable, while human thinking is hidden from view.
Action results from decisions in the human mind. Decisions to act are influenced by emotion, reason, and instinct. The thought process prior to action is object of psychological study. The action itself, and its consequences is the object of praxeological study. Economics is the branch of praxeology dealing with exchange/trading, applying logic to the epistemological class of humans and their actions.
Humans have a highly evolved language and most are literate, able to read and write to some extent. Man is a social animal drawn to others for companionship and trade. Humans interact, banding together in groups. Large groups are called societies.
In isolation, a human can only prosper by his own production, but in a social situation exchange, coercion, and intervention become possible. Society enables subjugation.