On

on + date e.g. on 27 Apr
on + day e.g. on Friday

on + street e.g. on Wall Street
on + coast e.g. on the East Coast
on + floor e.g. on the 3rd floor

on a vehicle e.g. on a bus, on a train, on a plane
on foot
on the cover (of)
on a trip
on sale (=for sale at a reduced price)
on schedule
on TV / radio
on the phone
on a farm
on a map
on the other hand
on purpose (=intentionally)