Regarding the writing format of the preface and the introduction of the work, it can be:
A brief introduction to the author's life, a brief introduction to his works, and comments on the author or his works.
About a person's profile:
Name, date of birth, where and who (author, occupation). Then there is an introduction to personal achievements, which is basically an achievement in one sentence. (Remember the site URL: www.hlnovel.com