There are a couple really great points made above.
This is the first. All the great EVERYTHINGS learn from the masters and then evolve the artform. Artists, scientists, athletes, poker players. There are concepts like pot odds, implied odds, weak vs strong starting hands, protecting a hand, getting a read and isolating a weaker holding, etc., etc., that are so fundamental to the game that you can't get anywhere without them. These things are, of course, not impossible to discover on your own. But because they are so fundamental, all the self-exploration in the world isn't going to take