In Italian, there are two main types of prepositions: simple and compound.

Simple Prepositions:
These are one-word prepositions. Here are some examples:

• a means "to"
• di means "of"
• da means "from"
• in means "in"
• con means "with"

Compound Prepositions:
These are made by combining a simple preposition with a definite article (which is the word for "the"). Here are a few examples:

• al means "to the" (from a + il)
• del means "of the" (from di + il)
• nel means "in the" (from in + il)

How to use them in sentences:

• For simple: Vado a scuola. means "I go to school."
• For compound: Vado al cinema. means "I go to the cinema."

By knowing the difference between simple and compound prepositions, you'll be better at making correct Italian sentences!