system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] How did Bruce Wayne approach all of these different people to teach & train him?

So Bruce Wayne travelled the world during his youth, learning from the best martial artists, detectives, criminologists, scientists, gymnasts and so on. 

How exactly did he approach these people? Did he pay them? 

Was Bruce up front with them about what he was planning to do? If not, what did he tell them he was planning to do with this knowledge?

Did any of his mentors become suspicious or weirded out by Bruce? 

Did anyone refuse to train him?
gpt
His experiences varied by person to person. Some people were mercenary types of folks who took money, but most were just taken with his sincere interest in their craft and drive to master it.

For example, in The Man who Falls, Bruce hiked a remote mountain range to train with a martial arts master/hermit named Kirigi. Upon arriving at Kirigi's lair though, he found it empty, so he meditated inside for three weeks straight without food or water, until Kirigi revealed himself, and made Bruce do chores for several months until finally training him.

He generally didn't let anyone know he was Bruce Wayne though and assumed false identities. Although some figured it out at one point or another, namely expert detective Harvey Harris, who realized that "John Smith" was Bruce Wayne pretty early, but let it slide.

Bruce didn't even know he would become Batman eventually at that point in his life, so he couldn't entirely articulate to them how he was planning to draw everything he learned together quite yet, even if he wanted to.

There was an old story called The Many Deaths of Batman where one of Bruce's mentors realized he actually trained Batman many years later, and went crazy cause he thought that Batman's enemies were going to find out and come after him. 

On the flipside, there was another story where Riddler kidnapped a world famous escape artist and forced him to recreate his ultimate escape challenge for Batman, but it turns out that Batman knew the special techniques needed to get out of the trap because Bruce was the only person on Earth the escape artist passed his secrets onto years before. This also let Bruce know that his old mentor was in Riddler's grasp, and let the escape artist realize that he trained Batman many years after the fact.

There were a couple teachers he had falling outs with, notably Ducard and David Cain, because he couldn't abide by their casual reliance on lethal force, and cut training with them earlier than expected.