a short line of text at the beginning of your book dedicating the book to someone you really like
When do I turn in my dedication?
Around the time you do copy edits. If your editor doesn’t ask for it, you’ll need to bring it up yourself.
Must I do a dedication?
If you really don’t like anyone enough to dedicate your book to them, just skip it. Kidding. It’s definitely optional and many books have no dedication.