Win one of ten poker books from D&B Books

Advice: "You can't win if you fold".
From: Pleno's FUTURE BOOK ♦

but in case that wouldn't count as a "legit" answer, then:

"WHY people like to play SO MUCH out of position when not forced to !!? Poker is a game where you make most money by avoiding difficult spots with marginal hands. You don't get penalized for folding pre-flop. So JUST FOLD !" - from a very nice book imo, called LET THERE BE RANGE! by Tri 'Slowhabit' Nguyen and Cole 'Cts' South.

Stack to pot ratio (SPR) when we are commited and when not.

by James "SpliSuit" Sweeney - Dynamic Full Ring Poker

how to use implieds

Sklansky, SOP, Semi-Bluffing

Initiative + Position = Profit

Can't believe this wasn't mentioned yet...

To win at poker, you have to be very good at losing.
- Tommy Angelo

First thing I learned were pot/implied odds in Theory of Poker.

how important is the mental game

The Theory of Poker: The concept of Pot Odds

thin value bets on the river

The first important lesson i learned from a poker book was how to analyze a hand by Barry Greenstein ♠_biggrin:

Donkbet-Prinzip: Supersystem

"It depends."

big hand big pot, small hand small pot

It's one big session.

play exploitative

Never bluff a fish!!!

If you don't know yourself what you are doing how can others read you?

The Education of a Modern Poker Player

It´s one big session.

Poker is a game of small advantages!

"The Pokermindset"