Some of the day trading theory behind predicting a commodity will turn at the same point it turned last time:
The market variation is determined by "the big guys". The huge investment firms that have tons of smart people and tons of money to play with. They will predict that something will turn from dropping to gaining at $11, and they are a lot smarter than you or I. So they put in a ton of "buy orders" for $11. When the stock drops to that point, their buy orders are triggered and a huge amount of that commodity is bought on their behalf. This causes the price of the commodity to go up, because they buy such a huge amount. Individual traders are too small to affect the overall market like this. Anyway, the big guys buy orders caused the commodity to turn at their $11 point. The cause of the commodity turn is due to the big guys orders, be they buy or sell orders. Remember this! And not all of their buy orders got filled before the prices started going up again. So a portion of those buy orders are still sitting around waiting to be fulfilled the next time the commodity drops to $11.
That's where us individual day traders come in. We want to piggyback on the big guys. If we can predict that they still have unfulfilled buy orders sitting at $11, that's where we want to put OUR buy orders! We do this prediction based on the charts of historical prices. As I said in a post above, it doesn't matter if we're looking at gold or chinchillas. We are following market swings based on the big guys purchases/sales, not on anything inherent to chinchillas. OK, now you have to realize that there are not an infinite number of buy orders from the big guys for $11. Eventually those will all get fulfilled or canceled. So that $11 point that we identified is relatively short lived. Once you see the price drop to $11 and bounce back up two or three times, you have to assume that all those unfulfilled buy orders have dwindled away to nothing. So there is no reason for the individual day trader to hang on to $11 as a magic price anymore. Abandon it, do research into other commodities, and be on your way. This is also why day trading strategies are not always the best for long term investing. Say the big guys had their buy orders set for $11. Do you think that those unfulfilled buy orders are still going to be hanging around for 12 years? No, they would have been cancelled by then.
Day trading is basically "Get in, then get out quickly". You will end up with more losing trades than winning trades. That is guaranteed. However, you structure things so that your winners bring you LOTS of money and your losers take away only a LITTLE money. Therefore, if you did ten trades in a day and you made money on two but lost money on eight, those two winners would have brought in enough money to cover all the losers, and then some. You have to do some analysis and determine if you expect the commodity to go up much more than go down. You might set a buy point at $11 and then a subsequent sell point at $20. So you are grabbing your winnings of $9 per share. But, and this is very important, before you set your sell order at $20, you have already set a "stopper" at $10. So you are cutting and running if you hit a $1 loss. So you can see how your winners gain you much more than your losers take from you.
You can probably guess that the big guys control the market. If they want a stock to turn at $11, all's they have to do is put in a ton of buy orders at $11. That's it. The sheer volume of their buy orders will force the market to turn. Because they wanted it to. Now, this is illegal, trying to influence the market. But impossible to prove. So it happens all the time. Since we as individual traders can't do anything about it, well, we just ride along piggybacking on the big guys and grab some profits right alongside of them. Similarly, you will find some shadier investment firms that in their greed, want to take advantage of not-too-savvy traders. So they publish reports saying, "This stock is HOT. We recommend you buy it when it drops to $11". Now why would they say that if it were bad advice? Because they are sitting on a ton of that stock with sell orders for $11. They want to dupe you into buying, because they can't sell anything unless there is a buyer for it. They want to dump this stock, and you are the perfect sucker to dump it on. Most investment firms are not like this. But some are. And you'd be surprised at the well known names of some of them.
Another point that may be becoming obvious. In order for you, the individual trader, to buy a stock there has to be someone willing to sell it to you. Ditto for the reverse if you want to sell a stock. You have to realize that your gain may well be some elses loss. Not always, but that's often times how it works out. You don't personally have to find a buyer, that's what brokers do. If THEY can't find a buyer, that is the definition of an "unfulfilled order". So basically, you are depending on always finding someone stupider than you are. This is not difficult in the market. So when I say to sell your gold now, that implies that some poor fool will buy it. You are hoping that your decision to sell was the right one and you dumped it right before it crashed. But what of the poor fool who bought it from you? They took it in the shorts. That's why you don't want to be in the stock market, day trading especially, unless you know what you are doing. You sold your chinchillas because you'd researched chatter on the eco forums about endangered species. You were informed and knew what you were doing. Your buyer bought your chinchillas because they liked the color of their fur. Maybe not the brightest move on their part. But without them, the market wouldn't work.
p.s. - Above I was using example of "Buy low, Sell high". The opposite can be done as well, "Sell high, Buy low." You may ask, "How do you sell something that you don't own?" That's easy. Your broker "loans" it to you. You promise to pay them back for it later. So you sell it (the loaned stuff) when it's high, then buy it again when it's low. Then you give it back to the broker who loaned it to you. This is called "shorting". Or course, if you sell it high, and then it goes even higher, you don't have much choice other than to sell it and take a loss when you "return" it to the broker. But this is no different than before, you set a stopper at a small increase in price to limit your losses. In this case, you stopper is ABOVE your original initial sell price. In a "buy low, sell high" transaction, your stopper is BELOW your initial buy price.