There are SO many to choose from !!!

I got the MACD, RSI Moving Average, and the Stochastic....

I somewhat starting to learn how to read these chart, however,

- The stock in the attached picture, SPX; how would I guess which way it will turn?

- XYZ is on an upward trend for a week, how do I know it won't start going down as soon as I buy them (I know that no one can predict that, but I'm sure some of you pros have a "calculation" or "sign" that you use to make a decision)