Answer:
the reader needs to know what is definitely true and what may be true.
Step-by-step explanation:
Facts are absolutely true. They are real things about the world that are set in stone. Opinions, however, are not always true. Anyone can have a biased and wrong opinion that they believe to be a fact while it isn't. Opinions are what you think, not what you know.
Knowing what is fact and what is opinion is a very important skill because it allows you to make good research and know if it is true.