So..... I managed to earn 0.1
BTC 
with the 0.1
BTC what is the fastest way to get more btc?
Highly depends on the skills you have and what services you can offer to others that may be of use to them. There is no such thing as easy and fast money. You need to work hard for it. Also, I don't think there are many options out there for you that you can choose from and invest that bitcoins of yours. Trading is still risky even though you have some little knowledge about it. Gambling don't always end up well because the possibility of you getting lost is higher than you actually beating the house edge. Why not try doing things that you are good at and offer it to someone that might need it? Like graphic designing, coding, writing articles etc?