We usually do not use an article before words that express generalities. Sometimes we do not use an article before non-count nouns. Here is a good article explaining the important rules.
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Vctory OngBesides that, I also saw "a nice wine" before!Yes. In this case, wine is countable, because it is referring to a vintage of wine, or a variety of wine, not the general liquid "wine", such as:
can wine be countable?
thank you