The keyword term "patriot day true story" functions as a noun phrase. The main point, or the head of this phrase, is the noun "story." The other words within the phrase act as modifiers that describe and specify this noun.
A detailed grammatical breakdown shows that the head noun "story" is premodified by two components. The word "true" is an adjective that specifies the nature of the narrative as being factual or non-fictional. The term "Patriot Day" is a proper noun that functions as a noun adjunct (or adjectivally) to classify the story by its subject matter. This construction narrows the topic from any story to a specific, factual narrative about Patriot Day.
For the purpose of creating an article, this analysis dictates that the central subject is a narrative account. The terms "true" and "Patriot Day" are not the primary focus but are essential descriptors that define the scope and veracity of the content. Therefore, the article's main point must be the presentation of a factual account or personal testimony related to the events commemorated on Patriot Day (September 11, 2001).