What is the main purpose of nicholas nickleby by Charles dickens?

My favorite book! A young man, Nicholas, is left peniless by his improvident father and is forced to work at a terrible school for money. He meets a poor, damaged fellow named Smike and runs away with him to seek their fortunes. Meanwhile, his sister Kate has been asked to entertain a bunch of barbaric "gentlemen" and is assaulted by Sir Mulberry Hawk. I hope this wasn't for a book report. If so, you are a scumbag. Otherwise, it is a fantastic book and I highly recommend it. Merry Christamas!