The Buddha taught about Four Noble Truths. The first truth is called “Suffering (dukkha),” which teaches that everyone in life is suffering in some way. The second truth is “Origin of suffering (samudāya).” This states that all suffering comes from desire (tanhā). The third truth is “Cessation of suffering (nirodha),” and it says that it is possible to stop suffering and achieve enlightenment. The fourth truth, “Path to the cessation of suffering (magga)” is about the Middle Way, which is the steps to achieve enlightenment.
Buddhists believe in a wheel of rebirth into different bodies. This is connected to “karma,” which refers to how a person’s good or bad actions in the past or in their past lives can impact them in the future.