The meaning of life. The nature of knowledge, of truth, of beauty. What a person is, if anything, and what e should do---ethically, morally, and spiritually. Whether concepts are real, and whether concepts such as spirit make any sense. The nature of language, how and whether language attaches to the world, and how and whether language determines thought. What the meaning of meaning is. The essence of being. Determination of the definition and scope of particular ideas, such as the term ``philosophical problem''.