1.  According to Sartre, the starting point of existentialism is

According to Jean-Paul Sartre, the starting point of existentialism is the concept of individual existence, freedom, and choice. He believed that existence precedes essence, meaning that a human first exists, encounters themselves, and then defines their essence or nature. This is in contrast to the idea that essence precedes existence, which suggests that a human's nature or characteristics are defined before they exist in the world. Sartre's existentialism emphasizes the individual, the experience of choice, and the absence of rational understanding of the universe with a consequent dread or sense of absurdity.