PositionsⓘSign vs. HouseSign is how a placement expresses — its style, its
native language. House is where it acts — which
area of life it shows up in. The same planet answers a different
question depending on which one you're reading.
Houses are read first because they are the more individual layer:
a planet's sign changes about once a month, but its house changes
every ~2 hours, so two people born the same day share every sign
and still have completely different houses.