simply dont hand money over to scammers promising large profits.
simply dont hand money over to scammer who you cant find where they live or who they are in the real world
simply dont hand money over if its more than your prepared to lose
simply dont hand money over if you think the scheme is too good to be true.

realistically if a company can make a profit, they wont tell anyone. they will want to keep it a secret so they can profit without competition or without others creating walls to prevent them profiting. so if someone is saying they can make you profit.. stay away