If you want to do everything right in every sector, knowing a lot about it will make you more successful. Trade without knowledge will cause you to lose your money. If you know how to take smart risks, you will not have a chance to lose money.
Let's just accept the fact that people are still going to make mistakes no matter what they do because there is no perfect person in this world, but these mistakes will determine on how they act each day in order for them learn they must have to make mistake first. People are too naive even if you do tell them the right thing to do, we are to ought to know more about in life rather than having a vast knowledge of mostly everything.