Prepositions are words or phrases that are typically placed before the substantive and showing a relation of the substantive to an adjective or a verb. Prepositions come in very handy to show a relation between two completely different objects. Take for example:
The ball is on the table : The preposition ‘on’ shows the relation between the ball and the table.
The nine prepositions, mainly, are placed in the order :
di - of
a – to/at
da - from
in – in
con - with
su - on
per - for
tra - between/among
fra - between/among
Nowadays, In Italian there hardly any difference between fra and tra (former: "among", the latter: "between"). They are nearly interchangeable because the rule euphony comes into picture: tra fratelli (among brothers) and fra i tralicci (between the power pylons).
Intorno - Around
accanto a - Beside
parte – front
vicino - near
opposto – opposite
dietro – behind
sopra – above