Chinese countable/uncountable nouns (How do they work? Examples?)
I think it is a terribly bad idea learning Mandarin by trying to map grammar from Western languages onto it.

There is no such thing as countable nouns in Chinese, precisely because nouns do not have plurals.

Conversely, you can make any noun ”countable” by adding a classifier to it： 你要一杯咖啡吗？