How to earn money with bitcoin ?
if you wanth growth your money with bitcoin
you can trading
trading altcoin you can trade in poloniex bitrex or c-cex, because is trade altcoin very fast growth money
I think if you want to use trading methods to obtain bitcoin, try to use exchange sites large and reliable example poloniex, they give a list altcoin nice and they also sort altcoin nice to sign into their trade, so it is not arbitrary altcoin entered to the site, so you do not have to worry about the scam altcoin