Care to tell me about it?

Or specifically, her philosophy.
Her philosophy is called Objectivism. Got this from Atlas Society:
Objectivism is the philosophy of rational individualism. Objectivism holds that there is no greater moral goal than achieving happiness. But one cannot achieve happiness by wish or whim. Fundamentally, it requires rational respect for the facts of reality, including the facts about our human nature and needs. Happiness requires that one live by objective principles, including moral integrity and respect for the rights of others. Politically, Objectivists advocate laissez-faire capitalism. Under capitalism, a strictly limited government protects each person's rights to life, liberty, and property and forbids that anyone initiate force against anyone else. The heroes of Objectivism are achievers who build businesses, invent technologies (such at Bitcoin), and create art and ideas, depending on their own talents and on trade with other independent people to reach their goals.
Objectivism is optimistic, holding that the universe is open to human achievement and happiness and that each person has within him the ability to live a rich, fulfilling, independent life. This idealistic message suffuses Rand's novels, which continue to sell by the hundreds of thousands every year to people attracted to their inspirational storylines and distinctive ideas.