@PotomacBobA "Foreword" is not part of the story. Typically it a a brief (couple of paragraphs, although I have read ten pages or more in some large tomes) synopsis of information that is key to the main body of writing.
Common subjects are citing a source or sources if your story is going to be significantly diferent from previous works.
For example, in the non-fiction book: Myth of the Great War, the author cited access to Soviet Archives that had not been used in any previous publication. These were original first source documents, and were contrary to speculation by second or third party sources in most well known books about WWI.
Or, as I recall, in the fictional story: Old Friend of the Family, the Foreword was supposedly by Dracula, and though only a paragraph, was supposed to alleviate a lot of confusion, if you didn't know the point of view character was Dracula (as the story was set in the 1960's).
Also, in a Foreword, an author might thank people who assisted him, or inspired him or her. Could be a researcher, librarian, family member, or a particular veteran, or group of veterans if it is a war story, for example.