ES Hourly - Simple Analysis.
To keep it as simple as possible:
4365 is a key level as clearly depicted. While we are below it, there is bearish sentiment. Above it, bullish.
~4345 is a one hour demand zone because this is where price was able to fill the gap, while also having a strong push above a previous high and breaking above prior resistance. Price has tapped into that demand and has currently shown strength, but we need to see it get back above 4365.