Trading is very simple.

First, determine the overall direction: Bull market OR bear market.
How to define bull vs. bear?
If it drops in a week but recovers in three days, it's a bull market.
If it rises in a week but crashes in one day, it's a bear market.
In a bull market, go long. In a bear market, go short. When it's gone up too much, go short. When it's gone down too much, go long.
In the dimension of time and space, what determines whether you can profit is sometimes not the price, but your mindset!