Rule 1 : For the uncountable words, articles ‘A/An’ should be not be used before them. Such words are-
Luggage / Baggage / Breakage / Advice / Furniture / Information / Scenery / Poetry / Work / Soap / Food / Bread / Fish / Paper / Machinery, and so on
Ex- I know that he has much information. / The scenery of Himachal Pradesh is very beautiful.

Rule 2 : The words such as "News / Maths / Ethics / Politics / Phonetics / Economics / Statistics / Measles / Mumps / Rickets / Billiards / Innings" look like plural nouns but give singular meaning.
Ex- The news is not reliable. / I like my maths teacher.