The main roadblocks to success in poker arise when players experience both wins and losses. This is because gains and losses affect our emotional stability. When things are going well, it's easy to be disciplined. The real test comes when a player loses, and that's when true discipline comes into play. Poker is the most popular card game that requires players to be attentive, patient, mathematically, and also a little bit of luck. You can learn to play from scratch in a few hours, and to fully understand the game you will have to practice regularly. Most of the books are no longer relevant, since poker has taken several leaps and bounds in its development.