As the title suggests the theme of this book is about betting 'Against the Crowd'.
Throughout the book you will find references to 'the mugs'. These are your opponents. Not the bookies. Bookies are commision agents. It is other punters that determine the prices of horses not the bookies.
Potts explains some good techniques of how to do the opposite of what the mugs are doing. You can learn a lot of why not to bet something rather than follow the sheep.
Like Nick Mordins Betting for a living, he displays his betting diary of his major bets during 1994.