A "sub genre" is essentially a classification of something within the genre it has already been classified in. For example hip hop might be a genre of music and a sub genre might be electronic hip hop. Electronic hip hop is another level of specificity to describe a musical genre, beyond the larger genre which is hip hop. This same method could be applied to many artistic concepts and classifications more generally.
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What do we have to do in this?
A. making collage fine art
She was a painter and sculptor but she was best known for her collages.
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target audience, what are you showing and why will they look at whatever it is you're making
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