The best advice to take is not to take any advice at all. If you are not personally knowledgeable about an investment that you are trying to make, no amount of outside advice in the world is going to give you a better chance to profit. Whether you win or lose, it is based on luck. And luck is no way to play the markets.
One should only invest in an industry and a business that one has personal knowledge of - information that the outside world looks over or is able to see but not understand.