I seems to be recommending lots of books at the moment. Currently reading these two Max Gunther books on the Kindle.

"The Luck Factor"

"How To Get Lucky"

Have had this Max Gunther classic for a long, long time. Kindle edition here

"The Zurich Axioms"

The best racing ideas come from non-racing books.

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Pixie

"It's worth remembering that profit isn't profit until it's spent off the racecourse." -- Crash