Prepositions of place

in

on

at

inside an area or space
in the city, in the sky, in bed

in contact with a surface
on the wall, on the table

close to
at the table, at the bus stop

on a line
on the river, on the equator

before nouns referring to a place or position
at the top, at the front, at the end
but in the middle

arrive in a city
arrive in London, in Amsterdam

arrive at a small place
arrive at the station, at the meeting

when expressing 'towards'
point at something, smile at someone