Abstract nouns are often qualities or attitudes but they can also be feelings and ideas. Feelings and ideas are especially important to describe when writing a story or poem.
How many abstract nouns can you think of? Feelings such as sadness, contentedness, anger, sorrow, fear, excitement, apprehension, anxiety, calmness and boredom are examples of abstract nouns. Testing these words with "the" and "a" is not especially useful, although many abstract nouns can take one or the other of these articles in certain circumstances, for example: "the anger in the room was overwhelming".What types of ideas count as abstract nouns? How about: freedom, justice, equality, citizenship, friendship, belonging, accountability, dependability, belief....the list goes on!
To give you a good grasp of abstract nouns, try this second English quiz on the subject.