do research about the website you want to join in.
But not every info is true.
Some website has good comments, but they scam and run your money.
Some website has bad comments, because some competitors slander them.
So only you can do is do research and make your own decision.
I don't buy HYIP, don't gamble. Just some current deposit and fixed deposit on OXBTC.COM.
I treat it as wallet.