Very good topic, maybe it will make many players think about the fact that they play gambling without much knowledge, they just learned or heard something and started playing, and this is clearly not enough to earn money in this difficult occupation. By the way, I also did not read any books about gambling, watched several videos on YouTube, read forums about how other players play and decided that this may be enough to be successful in gambling, but obviously this is not so, because I can not win, my bankroll is slowly decreasing.
Gambling usually does not require any special kind of knowledge to play and win, and by gambling, I mean actual gambling like playing casino and slot games, and other games based on pure luck.. But then, reading books on this topic can actually teach the basics, like how we can maintain a good gambling habit like practising responsible gambling and all that, what we know as a knowledge in this regard does not contribute anything to our winning or losing games, since this is purely based on luck, but can only help us not become addicted gamblers.
And talking about sports betting, some book knowledge can help here, but it's on the basic level, sports is very dynamic and change from time to time as player leave and players come in, I've talked about this in my previous comments on this thread.
So, book knowledge about sports betting can only teach the basics of betting, it doesn't not help in any way when it comes to choosing a team to place bets on, this will always be based on latest information you (the bettor) have on the team playing.