I have always said the only way to learn any game, is to play it. On-line
poker sites allow you to do this without it costing you a small fortune to learn, Ever since I turned 18 and regularly started Playing Pub games Like Darts, Pool, Snooker and various Card Games, I have had to learn from better players and it has cost me dearly, but I always was a quick learner so it didn't take me long to recoup the money I lost.
Poker is a different Beast in that it is always evolving, and if you don't evolve with it, It can crush you!
Watching Early Poker Shows from the late 90s and comparing them to todays Games, shows how different the game is played today than it was 25 years ago.
It is also nice to see how young Players Like Phil Helmuth and Daniel Negreanu looked 25 years ago.