I read about PUA about 11 years ago when I was single. The biggest take aways for me were simply learning what behaviour is unattractive to women, and what is attractive, and why. You don't need to manipulate anyone or go through any sort of "step system" if you simply understand what behaviour most women find attractive and unattractive. Hell, it helps you actually know when women are attracted to you, which for most guys would be a massive help as women are pretty subtle, and if you don't pick up on it they'll probably move on to someone who does.