There is no fast way to get rich there is always risk involved either in investing or gambling , i personally think that the best way to grow your bitcoin is to invest because gambling involves more risks and you can always get analysis to help you predict the market
Lol the OP where asking the best investments. and you say it is best to invest. I think there is no answer here
I thought gambling could even say investment, when you bet your luck by putting your money in the bankroll a gambling site