what is the meaning of life and how can you confirm that you know the right answer without bluffing too much
The meaning of life is a philosophical question that has been debated by many thinkers throughout history and is still a subject of discussion today. There is no one definitive answer to this question as the meaning of life can be different for each individual.

Some people believe that the meaning of life is to find happiness, to fulfill one's potential, or to serve others. Others believe that life has no inherent meaning, and that meaning is something that individuals create for themselves.

In terms of confirming the right answer, it's important to keep in mind that there is no objective way to determine the meaning of life. Each person must make their own meaning based on their own experiences and beliefs. That being said, it's possible to have meaningful discussions and debates with others about the meaning of life and to share one's own perspectives and ideas. However, it's important to approach these conversations with an open mind and respect for others' opinions, even if they differ from one's own.
Who are some famous philosophers who have talked about this question specifically?
Rene Descartes (1596-1650) is a representative of determinism, a far-reaching term, which most widely states that all events in the world are the result of previous events. In this view, all of reality is already in a sense pre-determined and therefore, nothing new can come into existence.The acceptance of determinism makes one into a mere thing, a mechanical and non-autonomous entity without the power to deliberate or change one's direction in life.

Confucius (551-479 BC) is a Chinese philosopher who tells us to cultivate virtue called Ren (仁) which is an altruistic sort of feeling one experiences when taking care of one’s children and parents.
Democritus (c. 460 – 370 B.C.) formulated the idea of Hedonism, which offers us a life based on seeking pleasure and avoiding suffering. Simple pleasures like eating, dancing, and playing music are meaningful in themselves.

Emmanuel Kant’s(1724-1804) proposes that every human action should be judged according to a universal maxim, or principle. If an action violates a principle then a person failed their duty toward humans. For example, if people followed the maxim kill anyone you dislike, when applied universally, it would lead to the end of humanity. So, the meaning of life is in fulfilling your duty to follow universal principles.

Friedrich Nietzsche (1844-1900) is most often associated with Nihilism, also called Pessimism. Nihilism  is the belief that nothing can make life meaningful. The Nihilists see something inherent about humans that prevents us from finding meaning in life. It can be the human tendency for being dissatisfied or always seeking something or being bored once it is found.
Explain to me more about Nietzsche's philosophy.