Micah steals money from his mom but then cops to it and is then "Blessed by the LORD" I think the storyteller is being sarcastic.
She wanted to use the money for graven and molten images. Micah uses the rest to hire a Levite.
Chapter 19 is an obvious retelling of the story of Lot and Sodom & Gomorrah but with a grotest twist .
Chapter 20 is all about the Benjamins. Still not exactly sure why they would go to war against the rest of the tribes (other then condoning the gang rape of chapter 19). After the battle in which al the women were killed, only 400 Benjamin males remain. What to do? Wipe out another group and take their virgins. But alas, we're 200 virgins short. They pick up the remainder by kidnapping girls dancing in the fields.
You can't make this stuff up. Or can you?