Generally speaking, when one engages in negative actions (the cause), one will reap negative results (the effect). This is the causal result of bad karma. Correspondingly, when one engages in virtuous actions, one will reap virtuous results.
The real point of the Buddhist way is not just to understand suffering, but also to see the emptiness of suffering. We can use the teaching of the five skandhas to clarify the different dimensions of suffering, to realize the empty nature of the skandhas, and thereby to transcend our own suffering.
For any Buddhist practitioner, the ultimate purpose of practice is to attain complete enlightenment or Buddahood. To achieve this very lofty goal, we work to cultivate wisdom and accumulate merit, and through this practice we are able to benefit both ourselves and others.