Countable And Uncountable Nouns

Nouns in English are either countable-C or uncountable-U. Some can be both, countable and uncountable, but with a difference in meaning.

I have more work-U (work in general) to do than you. The picture is a new work-C by John Skelton.
Drinking green tea-U is good for our health. May I have a tea-C (a cup of tea)?

We never use “a or an” with uncountable nouns.
Uncountable nouns do not have plural.
We usually use verbs in singular with uncountable nouns: Money is on the table. The news is good.
We use other words to express quantity of uncountable nouns: Would you give me a loaf of bread? I have got two pieces of advice for you. I need a small amount of honey.
We use “some” or “any” with countable nouns in the plural and in the singular wit uncountable nouns: I have some friends in Poland. We have some food at home.

Some common uncountable nouns in English:
advice, behaviour, equipment, food, furniture, homework, housework, information, knowledge, luggage, media,research, scenery, stuff, transport.