For me it was this free book available on https://www.core-econ.org/ https://www.core-econ.org/ It is an easy to approach economics book. It helped me understan

For me it was this free book available on https://www.core-econ.org/ https://www.core-econ.org/ It is an easy to approach economics book. It helped me understand how a few simple ideas like free markets, firms and technological innovation led to the creation of the amazing prosperity of our civilization.