"Research produced by the University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin"
one more interesting knowledge is :
"The word bitcoin first occurred and was defined in the white paper that was published on 31 October 2008. It is a compound of the words bit and coin".
( The white paper frequently uses the shorter coin).
so guys you can also share good and short info about bitcoin.
Well there should be a course of learning bitcoin or crypto currency. But now days everything available on internet. Just google it what you want to know and google gives you thousand of searches. I search about bitcoin and crypto currency and increase my knowledge. To learn & earn with bitcoin you need internet and if you have internet connections available in your home everything is in your hand.