Book still is a book, theory is just a theory.
Books are best to be used as reference to widen your knowledge and view, which is the most importance of it, it is not meant to get some 'tips' of how to become rich.
It is not mean that what all insides are 100% true or 100% false. You need to use your knowledge to analyse, to justify or to determine whether it is applicable or not. Sometimes, reading through books also can get some inspiration of businesses or investment idea also.

But none of it should be followed blindly.

A lot of things are simplied to give as example, real business world or investment world are more complicated than that.
Just like people said invest in real estate sure make money one, (I think this is the major misconception in the market as almost everyone said so, but putting in FD, your FD also surely make money every year, right? but none of us or less people said so.) If property return rate is 7% per annum while FD interest also 7%, but still people will choose property be because of mis-conception as mentioned.
Just like in discussing in property subforum, a lot of expenses is not taking in as consideration for the like maintenance of houses, expenses spent, but people just look at the initial buying price and final selling price to determine and conclude property surely gain money one.

Don't get me wrong, reading through these books is benefitting for anyone, as you will have a broaden view in every aspect of it and can take a look at a bigger picture which may prompt one to make a more wiseful decision.