Very simple, it goes up because more market participants want to buy than sell. When the price goes down it's the opposite.
You can now go read some newspapers to search for their bullshit explanations. But the thing is, it doesn't matter at all. Because the charts already show you all the information you need.
Me and my trading compagnon we trade all the time stocks or commodities where we know nothing about. But sometimes the charts really speak for themselves. You could trade just with Elliott waves and Fibonacci.
