You can make money through CryptoCurrency in many ways like trading, replying bitcoin related post, and by a member of signature campaign. Another method is your can hold your bitcoin at bad time and sell it in when it price become high
Yes you're right, there's so many way on how to earn or make money through cryptocurrency. And trading is one of the good way to earn and also participate on any signature campaign ( just like you said. ) But for trading, before you do that you do some research or knowledge on how currency work, becuase it's so risky if you don't know how it works.