Nonfiction manuscripts read differently once they’re designed because order, callouts, typography, and page count can’t be fully judged until the book is real.

Your print cover’s barcode is missing, distorted, or won’t scan. Here’s what actually causes it, how much space it needs, and how to fix it before your next proof.

More than a quarter of KDP book categories are ghosts — selectable but invisible to shoppers. Here’s how to spot one and verify a category is live before you publish.

An ebook that looks fine on one Kindle device and broken on another is almost always a fixed-value formatting issue, not a file error KDP would catch.

Your KDP book has been “In Review” for days and you don’t know if that’s normal. Here’s what the status actually means, how long review should take, and when to contact KDP support.

Hardcover jacket wrap misaligned on IngramSpark or Lightning Source? It’s the same spine width math behind KDP spine text — here’s how to fix it.

IngramSpark print cost comes in higher than expected for a reason: it’s a page-count-and-trim-size formula, not a flat rate. Here’s how to calculate the real number first.

Text disappearing near the spine of your paperback? Gutter margin loss is almost always a margin math problem tied to page count, not a printing defect.

Blurry images in your KDP or IngramSpark proof? It’s almost always a resolution problem, not a printing error. Here’s how to catch it first.

KDP table of contents links not working? It’s usually one of two separate navigation systems failing — here’s how to tell which, and fix it.