If you only read six books about the market, this should be one of them. As well as being fun to read, "Random Walk" has finally, after 30 years of revisions and improvements, become a useful investment guide.
There is more than one appoach to success in the market. Some of them actually work, but they require more time and effort than most people have to spend. If, like most of us, you want to concentrate on your career and family and investment is a sideline then this book is for you. If I were to paraphrase the thrust of this book it would be, "First of all, do no harm."
Even if you follow a different approach, you would ignore the data in this book at your peril.