Buy and Trade is indeed adviced.

There is also an option for Renting Mining rigs or Hash Power. Although I was a bit sceptic, so far Aurora Mining is by far the most trustworthy site i have found for now. Please do note that there are a lot of scam sites that run of with your money before you can withdraw (although I haven't had that problem with Aurora Mining). https://www.auroramine.com/?ref=197961

Another tip, invest in research when it comes to coins you are going to buy and sell, you want to know if they have a active community, devoted developers etc etc

Good luck!