Similarities :
1. used when we don’t know the amount
2. used with both countable and uncountable nouns
Example :
1. Please give me some apples.
2. I don’t have any free paper to share.

Differences:
1. Used in positive sentences
Ex - She’s earned some money by working as a waitress.

2. Used in questions when offering/ requesting
Ex - Would you like some coffee?

3. Used in negative sentences and questions
Ex - She doesn’t eat any fish. She hates fish.