Prepositions

Prepositions show direction, location, or time, or introduce an object. They are usually followed by an object—a noun, noun phrase, or pronoun.

The book is about
The cat is hiding under the bed.

https://simple.wikipedia.org/wiki/Preposition

aboard	about	above	across	after
against	along	amid	among	anti
around	as	at
before	behind	below	beneath	beside
besides	between	beyond	but	by
concerning	considering	counting
despite	down	during
except	excepting	excluding
following	for	from
in	including	into	inside
less	like
minus
near	notwithstanding	on	onto	opposite
of	off	outside	over
past	per	plus
regarding	respecting	round
save	since
than	through	to	toward	towards
under	underneath	unlike	until	up
upon
versus	via
with	within	without