Well there's a lot of trusted legit sites .but what kind of investment do you prefer ?  If you mean overall sites there's a gambling and Trading sites that can make you a profit.
I would advice trading ,it can make you a great profit there if you know how to play and adjust on market situation . A trusted trading site for me are bittrex and pololniex.
Gambling trusted sites betking ,safedice and fortunejack . Try to search for it and it all depends on your decision im just giving you and advice and options . Well goodluck .searching is the best thing you can do.