Yes, it is true.
Much of our knowledge is found on the internet and not in the classroom. The knowledge of our teachers is very poor and it is based on education.
And do you know? Most of them are stingy in science, they do not teach thoroughly, only part and part we have to find out for ourselves.
When I joined Steemit, the promoters also taught half the way, the way they disbursed rewards, how to buy and sell STEEM and SBD they did not tell me even if I was willing to pay for that knowledge. But they are willing to buy if I sell it by sending it through my wallet. Not to the exchange, but I learned all that through the internet and I told people how.
Sometimes, our knowledge is not developed because of the many stingy people of science and hope to gain personal gain.