Well, I for one just wish it was ME making obscene amounts of money by trading commodity futures
However, the reality is that it is a very deep & liquid market and it is a constant battle of ideas between bulls & bears based on all available information. Unfortunately, not even with our BIG brains can we absorb all the given information as to world supply & demand and every economic indicator that affects them. And even if we could, the information would be stale as soon as we learnt it and therefore it would be a constant struggle to know everything all the time and then to act on that information. I am affraid it is a little too much for your average Joe Trader down there in the pits yelling & screaming, waving his arms and trying to sell or buy a few contracts during the open pit session.
Even we that have the luxury to sit at our computers and effectively trade electronically, there is only so much you can read and absorb in a typical 10-12 hour day. You certainly cannot know everything.
So the two basic schools of thought are fundamental and technical analysis and they are not mutually exclusive. Fundamental analysis looks at supply & demand factors. However, trying to trade on supply & demand factors alone is inherently difficult if you do not know exactly where you are? Also you have the interplay between exploration, development, extraction, refining, distribution, end consumer behavior, the physical market and the futures market and all other related markets such as ocean freight and infrastructure. Like a spider's web, if you tug at one end, it will move parts of the entire web. Small, insignificant events can in combination with other factors effect the overall price out of proportion to their individual importance.
It is like trying to read a roadmap which is sized 1:1. It is hard to get an overview. However, every trader should understand the factors which are driving the market. A basic understanding of supply & demand is essential. But, even fundamentalists use technical analysis to see where the support and resistance levels are to plan their entry and exit points. A train may be on the wrong track, going the wrong direction, but it is still not wise to stand in front of it. Last summer's rally was a classic example. Inventories were building and yet the price was grinding relentlessly higher. It was like subconsiously the market was expecting a big supply disruption and sure enough Katerina provided that event. How did the collective psyche of the market know? Simply, demand was strong & growing, there was very little extra capacity and no cushion should there be an interuption. As oil & gas demand are somewhat inelastic, you need a big move in price to effect demand destruction and bring supply & demand back into line. The huge run up in price this past summer was just such a rationing in action.
But, back to technical analysis. It is very important because at every price there is a buyer and a seller. So at every price one trader made money and one trader lost money. When the price returns to that level the market has memory. When the price returns to that level the trader who made money at that level, say by buying, may try to buy again. The trader who lost money at that level, by selling, may be reluctant to sell again, and may even decide to buy. So at major turning points it does become a self-fullfilling prophesy.
Also, say you wanted to sell at $60.00, but the price only went up to $59.95 and then went down quickly. Well, next time up you may put your sell order in at $59.90 to make sure your order gets done. This starts to build resistance, a number of sell orders, between $59.90 and $60.00. Similarly, if you have seen oil rally from $49 in May to $70.85 in August and you have been chasing the market, you may move your price expectations up. That is put in bids higher and higher until you are able to buy. $50 looks expensive until you get used to $60 and then $70 and then you think $50 is cheap. This would form the basis of support as buyers look for good levels to buy in the expectation that we may go higher.
Of course, as at every level there is a buyer and a seller, the overall chance of success or failure is always 50%. It is gambler's fallacy to think we went up, therefore we must go down. Anyone who was happy to sell oil at $30 because it went up in price from $15 would be nursing their wounds when the price went up and up to $60. There are no magical numbers, which is sometimes technical analysis gets a bad name from the uninitiated.
Basically, I thought the range yesterday would be $58.60-$60.40, which it was for yesterday's trading session. However, now we have broken support today at $58.60 and have moved lower to $58.40. The old support of $58.60 is no longer valid, but the resistance level at $60.40 is as it was tested yesterday and held. It proved a great place to sell.
Well, that is Technical Analysis 101. I hope it helps?
As for me, I am a great teacher and a lousy trader. Yesterday I really got whipped and had I just kept my short at $59.77 I would have been much happier this morning. I actually has a sell order at $60.35 which I cancelled before we got there!

Instead I am short at $58.60 ($56.50 in the Brent) and looking for a move lower on the break of $58.60 and the bearish close below $59.40 on the daily chart. If I am correct, we should now see a move down to $57.60-70 in the WTI with $55-56 as the ultimate goal ($54.50-55.00 in the Brent)? However, this will also depend on the products.
With supply & demand analysis it is easy to convince yourself you are right and the market is wrong. But, with technical analysis you always have levels which invalidate your opinion. That is another reason they are useful.

The organized state is a wonderful invention whereby everyone can live at someone else's expense.