The Four Noble Truths are the foundation of Buddhist teachings, outlining the nature of suffering, its cause, its cessation, and the path to ending it. First, Dukkha (suffering/unsatisfactoriness) exists in all life. Second, Samudaya is the cause of suffering, rooted in craving and attachment. Third, Nirodha is the end of suffering through the cessation of craving. Fourth, Magga is the Noble Eightfold Path leading to the end of suffering.
The Four Noble Truths comprise the essence of Buddha's teachings, though they leave much left unexplained. They are the truth of suffering, the truth of the cause of suffering, the truth of the end of suffering, and the truth of the path that leads to the end of suffering.