really unpredictable, sometimes we have to take a high risk to benefit, usually I always wait for the price is very low, but I think it seems difficult to make a profit, though I certainly get a moment when it can get high profits.

My method, patiently waiting for the price, when I stuck, backup, when prices are rising, I do not get too greedy to sell at high prices. but try to at least I did not get the loss.