Briefly put, the Four Noble Truths are as follows:
1) Dukkha or suffering is a fundamental aspect of our experience.
2) The cause of suffering is tanha or craving.
3) The end of suffering is the cessation of craving, which is achieved in enlightenment or nibbana.
4) The path to liberation from suffering is the Eightfold Noble Path (right speech, right action, right livelihood, right effort, right mindfulness, right concentration, right intention and right view).
Although craving is identified as the cause of suffering, it is not the first cause or the only cause of suffering; it is simply the immediate and most palpable cause of suffering (Walpola Rahula, 1978). It is a linked in a chain of dependent origination preceded by feeling, contact, and so on, and ultimately back to ignorance.