IMO, we know something, but not everything...
The thing is, there are always two parts for any interaction (or relationship) to happen - the guy and the girl... Each has to be interested, each has to contribute, it's not only up to the guy...
You can be the best PUA guy in the world but if she is not interested, it will simply not happen. You can be a casual guy with no PUA knowledge at all, yet if she is actively seeking relationship or NSA, you may simply just get lucky...
So the best approach for any guy is the simplest approach - go out and interact with girls. Duh. There is no point of creating theories and strategies without applying them in real world - and once the guy gets into real world (interacting with girls) everything becomes more simpler with experience...
Here is Magical Equation:
Fundamentals + Abundance Mentality + Persistence in interaction with different girls = Inevitable Success
There is no other way, should one eliminate Luck from the equation...
* Fundamentals will simply increase your attraction as a man, it will increase your real value as a man. Women do want man with high(er) value
* Abundance Mentality will eventually help to develop the right mind set, you will focus on different girls and you will not be "stuck in your mind" with one girl only, you will eliminate neediness to be with one girl
* Persistance is simply a key to any success. Believe in it, work for it (and you should work hard), and The Magic will eventually happen...
The equation doesn't apply to girls only, it can be applied in any area of your life...