Sometimes I hear people say: 'I've a good news for you'. Is the sentence grammatically incorrect? I know 'news' is an uncountable noun so you shouldn't use 'a' in front of it, but I also know that ...

Could you please explain countable and uncountable nouns? Cake is uncountable in certain cases but countable when we say: She baked some cakes. countable nouns Countable nouns are the names of ...