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The noun 'hobbies' is the plural form of the singular noun 'hobby', a common, abstract noun; a word for an activity done regularly in one's leisure time for enjoyment; a word for a concept; a word for a thing.
of Hobby
He has no known pets, but one obvious hobby of his is reading.
A penguin's hobby is swimming or dancing.
Tony's hobby is sk8boardin but that's his job not his hobby
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hobbies
Brazing for hobbies
what is Zendaya's hobby
The article "a" is used before "hobby" when referring to it in a general sense, as in "a hobby." For example, you might say, "I have a hobby of painting." If you are talking about hobbies in a general context, you might also say "hobbies" without an article, like "Hobbies are important for relaxation."
Tony's hobby is sk8boardin but that's his job not his hobby
The noun hobby is singular; the plural form is hobbies.