Another book you might want to read is, "No one would listen" by Harry Markopolos.
Harry was the mutual fund/stock broker in Boston who blew the whistle on Bernie Madoff. He goes into great detail on how the Mutual Fund and stock broker industry makes their money.
Spoiler alert: They'll knowingly sell you any amount of crap stocks and funds, so they can get a commission.
At the end of the book he says, "There are lots more Bernie Madoff's out there..."
So be careful.