Hello! I am new here and i need some help please!

Because of my bad english it isn´t hard to see i am not a native english speaking person - sorry for it!  
I have experience with mining ether (i have two rigs, 300 mhs) and experience with trading a little bit too. Because of the difficult by mining ether (going up and up the last weeks) i am searching any ways to invest my ether. There are a lot of channels on youtube and a new (maybe not a serious site) which had testing ethtrade.org. All are speaking well about ethtrade.

This is the one site wich i read about ethtrade:  http://ethtrade-erfahrungen-at.webnode.at/

Please help me, if anyone have experince with this site, please tell me if i could invest my hard earned ether there or not. Is this site a scam?

thank you,
Best regards stefan001