Many nouns have both countable and uncountable uses. There is usually some difference of meaning. Material nouns, for example, are uncountable, but we can often use the same word as a countable noun to refer to something made of that material.

Have you got any typing paper? (Here the noun paper is uncountable.)

I am going out to buy a paper. (= I am going out to buy a newspaper.) Here the noun paper is countable because we are actually referring to something made of the material called paper.

Have you got any tea? (Uncountable)

Could I have two teas? (Countable)

Many abstract nouns can have both uncountable and countable uses. The uncountable form is used with a ‘general’ meaning whereas the countable form has a ‘particular’ meaning.

Don’t hurry – take your own time. (Here time is used as an uncountable noun.)

Have a nice time. (Here time is used as a countable noun.)

I had a strange experience last week. (Here experience is used as a countable noun.)

I have got enough experience for the job. (Here experience is used as an uncountable noun.)

Singular countable nouns are sometimes used as uncountables with quantifiers like much, enough, a lot of or plenty of.

She has got too much chin. (Chin is usually a countable noun, but in this case it is used as an uncountable.)

Note that we use much with uncountable nouns and many with countable nouns.