I guess that you already started to earn your first Bitcoin after reading my previous posts. I decided to interrupt my guide with this note. As you may probably already found some sites here and there which offer you to invest your Bitcoins and get in return 200, 300 or even 700% in less than a few weeks.
Please, understand that even a “honest” Ponzi scheme is extremelly hi-risk operation where the operator generates returns for older investors through revenue paid by new investors, rather than from legitimate business activities or profit of financial trading. In Bitcoin world the cycle could be less than 2 week, and if you are not the first day investor you definitely will gain less than invest.