What were three important aspects of Olmec civilization?

The Olmec civilization, often considered the "mother culture" of Mesoamerica, is notable for its colossal stone heads, which are believed to represent rulers or important figures. They also developed a complex society with a hierarchically organized political structure, engaging in trade and creating significant urban centers like San Lorenzo and La Venta. Additionally, the Olmec made advances in art, religion, and early writing, influencing subsequent cultures in the region.