HTFs are what define direction.
But you must pair them correctly.
For ej:
Weekly → 4H
Daily → 1H
4H → 15m
1H → 5m
15m → 1m
And from this, volume depends on the (HTF) direction you want to execute toward.
Now, if you want to understand the candlestick sequence, you must first understand what OHLC and OLHC are.
To do this, observe each candlestick in a defined way:
Observe the weekly candlestick on the 1H timeframe.
Observe the daily candlestick on the 15m timeframe.
Mark the opens…. this will allow you to clearly see how the candle opens, manipulates toward a PD array, distributes, retraces, and closes.
I think this is a fairly simple explanation.