Are every thing need to take risk for it??

Yes, I believe in that. the bigger the risk, the bigger the gain. It is really an old saying but it proves to be true. But, on the other side, if you are wrong, the bigger the loss as well. For example would be investment. If you invest in the good company though the share is expensive, you gain more but if you invest in the bad company with the same price, you might lose a lot of money.