We use the indefinite determiner 'some' in the positive forms, when we are not interested in the exact number of a quantity.

• They have some friends in Milan.
• There are some good restaurants in the area.
• There are some trees in the garden.
• We need some money.

We use the indefinite determiner 'any' in question and negative forms, when we are not interested in the exact number of a quantity.

• We don't have any money.
• There aren't any people.
• Are there any interesting books in the library?
• Are there any letters for me?

We always use the indefinite determiners 'some' and 'any' with plural nouns.

N.B. - We can use some to ask for and offer things.

• Would you like some biscuits?
• Can I have some tea?
• Would you like some ice cream?