A great player can make a difficult shot and get position on the next ball 9 times out of ten.
A lesser player can make the same difficult shot and get position on the next ball 7 times out of ten.
It's not specific knowledge that make great players better than most. It is the ability to execute! This great player may or may not be able to help the lesser player increase their ability to make this shot. Most great players I have been around would just look at you and tell you that you have to practice more (or tell you to "Stay Down!"). On the other hand, someone that has been interested in stroke mechanics may be able to notice something that the player is actually doing wrong. The player will be able to try out some changes and get back to work practicing and maybe increase their shot making percentages. Now I don't believe this sort of analysis is rocket surgery

or anything but I do think people that pay close attention to mechanics are more likely to notice something than those who do not.
Of course most people that play the game long enough figure out a thing or two by venturing near to Lou's "Rabbit Hole". We may not be good enough to go all the way in but we can at least see the rabbit going in and out
Bottom line is - secrets, tips, tricks or whatever you want to call them are cool and some off them can get you out of a jam from time to time but for me - it comes down to plain old execution. This is where the pros excel.