Anyway, we believe that the best advice is logical and straightforward. Your mother did have a point about common sense, you know. That you are very important. Maybe, maybe not. This is not an easy question to answer.
Research is costly, in both time and money.
Most books are written for prestige and profit. No more time and money can be spent on them than will justify the prestige and profit they will reap. This means that many more books, seminars, etc. will be based on what people believe, from their own experience, to be true, than on a careful study of what research has shown. Before you leap to follow what sounds like great advice, question the sources and the applicability to your situation. No single book is going to answer everything everyone wanted to know about careers.