You might want to think of some lessons from folk tales that you know and put down a bunch of ideas. The next step is to decide which one is the best and create a folk tale with that lesson.
Some ideas are:
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A good lesson to include in a folk tale is the importance of kindness and generosity. Through the characters' actions and decisions, the story can highlight the positive impact of helping others and treating everyone with respect. This lesson can resonate with readers of all ages and cultures.