I heard it back in 2011 where in there was a huge hype of mining Bitcoin using GPU's and there were numerous facebook groups where they posted they rigs and also had many tutorials for other to follow or even customize their rigs in order to work better.
Actually, I heard it from my classmates a few months ago. In addition to that, I decide to conduct study about bitcoin to know it fully. Then, I found out that by using bitcoin I can make and earn money so that I asks my classmates to help and teach me how to get bitcoin in some easy way.Im glad that I know what bitcoin is because it helps me to sustain all my need in my daily life.
That's really great that you get to know more knowledge about bitcoin from your friend. You should study yourself too and introduce that knowledge to people as well because as your friend helped you like do that to everyone.
But learn yourself too. Learn the methods learn the skills. Become a deep know ledger about bitcoin. Then you can success in bitcoin. It might helping you right now as well after getting to know very deep it will help you more in a future. Good luck !