What makes a guru a guru ???

Most of the time, it’s from years of experience related to a certain subject. Although, in my observation, there are numerous gurus on any given subject, all with good input. I know a lot about early A body cars, but I am by no means a guru. I simply learned by assembling, and more often disassembling them. And, I rely on a lot of other likeminded people when I pursue an answer that I don’t know about them. And anybody that knows me knows that I have a very good memory for all things I encounter. That to me is a curse, I tend to never forget, and hold onto things for too long. I also tend to talk in movie, song and TV quotes! Just in case I need to answer that $1m question for all the money, I guess.