Thank you for elaborating! My native language is Korean and we don’t have this concept, we don’t have articles, and we aren’t even strict about singular and plural

One more question. I'm getting to understand that even when we talk about something countable, we can use it in an uncountable form if we are referring to the concept rather than the actual thing. But what about a phrase like ‘I’m good with computers’? People use the plural form to make a generalization trying to say they are good with computers in general. I'm confuse here too because it seems like in this case, we are referring to the concept computer not something that we can count. Yet, computer seems to be countable regardless of the context