Which kind of book to actually make
The hardest part of a book gift is not writing it. It is deciding what it should be. Four choices cover almost everyone. If the person has a life worth recording, a parent or a grandparent, make a memoir or a biography about them; you supply what you know and the flow asks the questions you would not have thought to ask. If the gift is for a child, make a children's book with them as the hero by name, with their pet and the things they are into written into the plot. If the person is a reader with a private favourite genre, write them a novel in it, which is a stranger and better present than it sounds. And if what you actually want to give is the story of the two of you, how you met, the year you both remember, the running joke nobody else understands, that is a memoir with the audience set to one close person. Choosing wrong is the main way these gifts disappoint. A generic story with a name inserted reads as generic no matter how nice the cover is.