"
Garden" and "
newspaper" are both countable nouns and it seems to me that we can use them with "a" (when you mention it first time or want to show that it's a single object) and "the" (when the object was mentioned before)
"a little rice" and "a little cheese" are grammatically correct. But I would use "a bit of rice (cheese)" in informal conversation.
P.S. about novels
If you speak about it in general so you should say
"Novel is the most..."
or
"The novel is the most...."
But if you start to speak about a particular novel
"A novel is the most..." would be correct
Anna