A week is five candles, and most weeks set one extreme early and the other late. Knowing which day tends to set which is the difference between waiting for a level and chasing one.
Why five candles is enough — The weekly profile is not a pattern to trade on its own. It is a way of asking, on any given day, whether the extreme you need is already in.
The common shape — One extreme early in the week, the other late. Monday and Tuesday tend to set one end; Thursday tends to deliver the other.
The flat week — Three quiet days followed by one expansion day is its own profile, not a broken week. Consolidation early is what the later move is built on.