Higher+ Lower level key time for Nifty 50

We are observing some key time which are important for today. The times are makred on chart.

When we are talking about Key time, that is those for the intraday usable for avoiding shock , if we are trading options while observing key support / resistances.

Key time is a concept of Price action :) Really ? What ?,

then what is price action ? I can be wrong here. But Key time from "Gann era" Concepts, are usable for short time trading.