Prepositions of Place
at, in, on
In general, we use:
at for a POINT
in for an ENCLOSED SPACE
on for a SURFACE
at
in
on
POINT
ENCLOSED SPACE
SURFACE
at the corner
in the garden
on the wall
at the bus stop
in London
on the ceiling
at the door
in France
on the door
at the top of the page
in a...