Most poker books and training videos on tournaments and Sit 'n Go's are by professional poker players who play at the highest stakes. Whereas you can learn a lot from studying them, they won't always be as useful to you when you're mainly playing at the low stakes.
Playing low stakes games against beginning and recreational players requires a whole different strategy and approach than playing high stakes games against the best of the best.
The Poker Book includes key aspects like:
While this (extremely) condensed version can never replace what you'll learn in the full books, it will be extremely helpful as a poker side bible to bookmark, dog ear, highlight, and flip through really quickly before and after your poker games.
Now, go start crushing the game.