Hi Berandir,
I would strongly suggest you what helped me and continues to help me a lot: study the legends (Daniel Negreanu, Phil Ivey, Tom Dwan, Phil Hellmuth, Patrick Antonius, Liv Boeree, Nacho Barbero,..). You have plenty of opportunities in YouTube. Daniel Negreanu even wrote some books you can buy cheap in Amazon.
Alternatively, what I just did, is buy the
App "Masterclass" - here you have unrestricted Access to Masterclass About Poker and Pokerstrategy from the masters themselves, Daniel Negreanu and Phil Ivey where they share their Train of thoughts on some of their previous
hands on world Championships and reveal step-by-step instructions.