When you are depending on that graph you need to have a more time so you can really manage not to lose money in trading and save some extra bitcoin in the next dont panic when the price is low wait for it always to be high again and everything will be fine.
The graph is just one of your basis but basically you need to study the necessary things to be successful in trading. Understanding how the market behave is one of your advantage since we are trading an unpredictable asset, it will give us best chance to predict right.