i told them that someone introduced me to this forum bitcointalk that if they want to know more about bitcoin and cryptocurrency at large that they should join the forum and gain more knowledge about it,
You can still know more about Bitcoin without being on the forum. The forum is just one of those mediums where Bitcoin is discussed. Some other places where you can learn about Bitcoin include reading books. Andreas Antonopoulos has a great book on Mastering Bitcoin. He also has a YouTube channel that is focused on Bitcoin. We have numerous internet forums where Bitcoin is also discussed. You can learn about Bitcoin through a podcast and many other ways. Just say in case one day the forum is inaccessible, you will know of the other means of learning about Bitcoin.
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He came up with this question 'why is the identity of the bitcoin founder (Satoshi Nakamoto) remained unknown'?, i will be very glad if any of the high ranked members can provide us with the answer so we can add it to our knowledge too. thanks.
Satoshi saw the future and knew that if he were here, there would be a popularity contest between his identity and Bitcoin. He probably knew the nature of humans and the government institutions: they'll always look for the fall guy when people start to blame his invention, Bitcoin, for the collapse of their economy or the increase in crime, among other things. Stepping aside was to save his invention. Please follow the links provided and read more about it. My answer is just from my own understanding. 
