I'm a bit confused about 'book holes'. However, many stories have lessons about perseverance. For instance, in 'The Little Engine That Could', the little engine keeps repeating 'I think I can, I think I can' as it climbs the hill. This story's lesson is that if you keep a positive attitude and persevere, you can achieve difficult things.
I'm not sure which specific 'book holes' you mean. But generally, the lesson of a story could be about friendship, like in 'Charlotte's Web', where the lesson is about the value of true friendship between Wilbur and Charlotte.
If by 'book holes' you might be referring to plot holes in a book. Regarding the lesson of a story, take 'The Lion King' for example. It teaches about taking responsibility for one's actions and the circle of life. The story shows Simba growing up and realizing he has to face his past and take his rightful place as king.