The houses are the least mystical part of a chart and the easiest to actually use.
If planets describe what is happening and signs describe how it happens, houses describe where — which department of life the activity shows up in. Work, home, health, partnership, money, study, travel, reputation.
A planet is not good or bad on its own; it is behaving in a particular room. Saturn in the house of work reads differently from Saturn in the house of home, even though the underlying instruction is the same one about structure and patience.
Reading a chart by house first is the fastest way for a newcomer to feel oriented. It answers the question most people actually bring: where in my life is this pattern going to keep showing up?
In a session we usually walk through four or five houses rather than all twelve. Coverage is not the point; recognition is.