We use some and any to talk about an unknown quantity of something.
Some is used in positive sentences.
• I have some friends.
Any is used in negative sentences and questions.
• I don’t have any money. / Do you have any milk?
We use much and many to talk about quantities.
Much is used with uncountable nouns (milk, time, water).
• How much water do you drink?
Many is used with countable nouns (apples, books, cars).
• How many books do you have?
We use a lot of with both countable and uncountable nouns.
• I have a lot of time. / There are a lot of people here.