What is the Best book to learn probability - poisson, binomial, regression, etc.
I am working as an odds adjuster at a bookmaker and need to advance my skills to an odds compiler level.
I think your question is worded a bit too "loosely". In any case: A number of excellent books are mentioned in this (aggregated) thread that deals mostly with Machine Learning books. From those mentioned probably The Elements of Statistical Learning is your best shot for a free book. All of them offer a general treatment for probability and regression.
Talking about non-free books I have found Statistical Models by Davison and Van Kampen's Stochastic Processes in Physics and Chemistry extremely helpful "to learn probability - poisson, binomial, regression, etc." but this is a quite open-ended approach...
Grinstead & Snell is very good (& free):
(Note it doesn't cover statistical topics e.g. regression, just probability.)
As you mention Poisson regression in a comment: