There are several added points to keep in mind when distinguishing fact from opinion. Suppose you went to the science fiction movie your friend spoke of and discovered the aliens actually had blue rather than green skin. You would then call his statement an error, not a fact. Sometimes, then, in the process of checking out whether a statement of fact is true, you will learn that it is not true, that it is not a fact at all. Opinions may be masked as facts.
People sometimes present their opinions as facts.
The truth of the matter is that frozen foods are just as good-tasting as fresh foods are. Despite the words to the contrary, the above are not statements of fact but statements of opinion. Remember that value words by nature represent opinions. They are subjective rather than objective. While factual statements report on observed reality, subjective statements interpret reality.