Truthfully, I am just sharing what "ideas" I see coming in on TradingView, those are where people are doing those analysis. I mostly follow Ichimoku and it's not showing that. It more determines where a trend is going. Knowing how to read it will show when is the best time to buy or sell. It's generally right 4 out of 5 times.
As far as prices and where these are determined is knowing how to place Fibonacci levels. I am no expert, just been diligently following this since Jan, took quite a few courses online now and watched a bunch of YouTube vids, so it's all learning to me still. But if you back test a lot of these methods, shit is crazy cause it works. People trade off emotions, that is what fib levels shows. It's some really deep psychological chit, but it works cause that's how people think.