The Buddha’s teachings on non-self are considered to be some of the most important for finding liberation from the distress we can experience in life, but also some of the most difficult to understand. Gil Fronsdal provides a brief introduction to the teachings on non-self and their connection to freedom from suffering. You can find his article here: Anatta and the Four Noble Truths
Joseph Goldstein provides a description of the teachings on non-self, and of several ways in which we can explore them. The investigation of different ways to explore the nature of what we identify with as the self leads to an appreciation of the different flavors of the understanding and experience of non-self. You can find his article here: The Flavor of Anatta: Reflections from a Theravada Perspective