Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
There are a few things to learn. Although the author repeats several times that he is not prescribing a bag of tricks, it is exactly that and the tricks are not applicable to 2020. I feel it was a genuine help guide to the decade it was written in and does give the reader a peek into that chivalrous era. The sheer competition lack of time and minute attention spans of the current make these well thought of suggestions redundant. I struggled to finish it because I had to weigh the pro and cons and discover the possibility of applications in my day to day. I feel it is best read one chapter at a time with extra time set aside to mull over it after every chapter.
This is a good book if read carefully. IF you implement all the lessons of this book without thinking - you will become one of those useless person who is a "YES SIR" type. But there are good qualities to learn from this book too.
What I do I like about this book is everlasting suggestion to how create better human interaction (and way go deeper before create connection). Its great for beginners to start socialise and win people around you. The best thing to read this book is re-read anytime you need to remind you some key points.
It is said that the more things change, the more they stay the same. This book was written 80 or so years ago. The advice is just as sound now. People don't really change that much. Good to read once a year.