English questions, please help.?

If it is a "count" noun (something you can count like apples), you do need to use the plural. However, if it is a "non-count" noun (like air), you do not add an "s." The problem is that count and non-count nouns differ in each language. For example, in English "bread" is non-count, but in many languages it is count. For native speakers this is rarely a problem. Unfortunately for ESL students it is often a problem when first learning English.

Examples:
I like hamburgers. (count noun)
I like meat. (non-count noun)
Jane likes bananas. (count)
Jane likes fruit. (non-count)

if the noun is Countable you add "S" (i like apples) if it's Uncountable then no "s". e.g. I like water. I like beer, etc

Not always. I like the apple is correct but I like apple is not. If you are saying something specific then it can be singular.

It would be I like apples


Hope this helps

If you are referring to something in general, put an "s" at the end, or make it plural.
I like women
I like fast cars
I like apples

No but as I think I like candy is right so is I like candies